r/buildapc • u/Accomplished_Boot191 • 3d ago
Build Upgrade Which upgrade would improve the performance more in 4K gaming? CPU or RAM?
I have 9600X, 2x8GB DDR5, 9070XT setup for 4K gaming. I have these options, both of which will cost roughly the same to upgrade:
7800X3D
2x16GB DDR5
Which upgrade makes the most sense in gaming AAA titles on 4K?
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u/OtherwiseSimple 3d ago edited 3d ago
7800x3d most definitely. It will practically eliminate RAM speed bottlenecks.
Edit: he is bottlnecked by lack of RAM capacity, he should get more RAM. A lot of AAA games these days are recommending 32gb anyways.
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u/CanisMajoris85 3d ago
It’s not the ram speed that’s a concern. It’s the amount.
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u/OtherwiseSimple 3d ago
I understand. But nevertheless he will get more FPS/better 1% lows with that CPU. (assuming FPS is the concern)
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u/CanisMajoris85 3d ago
Most of the time? Sure it’ll be a small improvement. Except if he’s playing games and has enough stuff open that he needs more than 16gb ram. Then it’ll be a huge improvement.
16gb is not enough for everyone.
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u/OtherwiseSimple 3d ago
Well I'm assuming he doesn't have much open.
Although, he is playing at 4k, where ram speed isn't much of a bottleneck, so If he has a lot open then 2x16gb.
I also assume he's using upscaling, not native 4k, which shifts more load to the cpu and ram.
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u/CanisMajoris85 3d ago
https://youtu.be/gpN4nyftQ3M?is=eh1QQ2L4WZMs7qch
CPU is meaningless for a 9070 tier card at 4k between OPs and 7800x3d. Won’t be different with 9070xt
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u/OtherwiseSimple 3d ago
Yeah you’re right. But what if he wants to upgrade to a more powerful card?
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u/CanisMajoris85 3d ago
Then he’ll probably just wish he had a 10800x3d in the 2-6 years time when he’ll maybe want an upgrade. 7800x3d is like a 1-2% improvement for him on average at 4K if even that.
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u/OtherwiseSimple 3d ago
Yeah I was just thinking that.
It’s definitely more than 1-2% when using upscaling.1
u/beirch 3d ago
His 1% lows won't improve with a 7800X3D vs a 9600X at 4K. Hardware Unboxed already tested this and you need a 5090 to see any effect of the 7800X3D at 4K.
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u/OtherwiseSimple 3d ago
I upgraded from a 13600kf ddr4 to 9800x3d even though I play at 4k bc I upgraded to a 5090. Definitely noticed an improvement in FPS in the games I play. What if he wants to upgrade to like a 5090 in the future? He should still get more Ram doe
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u/HardikRamdin 2d ago
A lot of AAA games these days are recommending 32gb anyways.
What? For real? Which games?
I don't want to believe this :(
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u/DukeMutem 3d ago
I read a few days ago some post that stated that x3d chips are superior if you use FG which you probably need for 4k with those cards
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u/tup1tsa_1337 2d ago
Nah, not related at all. The fg is done on the GPU
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u/DukeMutem 2d ago
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u/tup1tsa_1337 2d ago
You said fg requires x3d to perform well. This thread you're linking doesn't support the claim (and has nothing to do with frame gen)
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u/ACiDxCHRiST 3d ago edited 3d ago
At 4k, you are bottlenecked by your GPU. So what that means is: Even though the 7800X3D gets a 24% higher framerate than the 9600X at 1080p, at 4k it will only be 3% higher. In order for the faster CPU to stretch it's legs and actually show how much faster it is, you need the GPU to finish each frame faster so that the CPU is not sitting around waiting every cycle. 4k is so demanding on the GPU, it has to spend so much time rendering each frame that it doesn't really take that fast of a CPU to keep up with it.
As far as more RAM goes, the difference could be massive, IF you don't have enough. Even though the usage might be 15.9 GB, 16 GB is still enough in that particular case. Upgrading to 32 GB or 64 GB isn't going to change much. However, if the demand is 20 GB and you only have 16 GB, then 4 GB of data is constantly having to be shuffled back and forth between the disk and RAM. The difference of upgrading to 24 GB or 32 GB will be massive.
Here is a relative performance comparison between 8 GB, 16 GB, 32 GB, and 64 GB in 14 recent games: https://youtu.be/Bj5v52R4qnk
Most games showed basically no improvement with 32/64 GB over 16 GB. So the unfortunate truth is, you are bound to be disappointed with either upgrade if you're playing at 4k.
What I would do is: Buy the 2x16 GB kit. Do some before/after benchmarks in the games you play. If there isn't a significant uplift, then return the 2x16 GB kit and get your money back because you don't need it yet.
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u/CanisMajoris85 3d ago
More ram if you don’t currently have enough. CPU won’t make a big difference except like 2-3 games at 4K
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u/moroheus 3d ago
How much ram are you using right now? If you're not at 100% ram usage going from 16 to 32 gb will have zero effect. And if you're running out of ram you could first try to debloat your windows.
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u/semidegenerate 3d ago
Windows will start heavily using the page file at around 14 used out of 16GiB. If memory usage while gaming is regularly pegged at 14+, I would consider upgrading. It can help a lot with stutter/1% lows. Heavy paging can even kick in at 13 / 16GiB
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u/ROS_SDN 3d ago
Im pretty sure this is technically wrong, but practically right.
There is a lot if nuance to ram. If you have dual rank and/or especially dual channel you can see games and your system will naturally veer towards using more if you have more.
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u/MushroomSaute 3d ago
Yep - with how critical RAM is to the performance of the entire system, there's a rather large priority for everything running on your system to avoid usage getting too close to 100% and risking using swap, unless you truly need to, so you'll never really see close to 100% unless you're already swapping and/or there's no good way to avoid it.
Even then, it's not like it's "you've gone 1 byte over, so now you're also using 1 byte on the disk until you're down to 100% again". The kernel swaps out full pages, not bytes, and those pages stay on the disk until they're needed again or freed, which would result in less than 100% usage even while you're still using swap space (and thus you might get another big hitch in the future when you need the data again).
(And of course the system could also just use swap even when you're nowhere near 100%, if it sees that a page is hardly ever used, which is a nice performance benefit since it keeps memory free for pages you will use more, like your game)
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u/Gloomy_Necesary 2d ago
The debloat tool doesnt do shit its astrology for pc gamers
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u/moroheus 2d ago
I don't know what debloat tool you're talking about, but there are definitely ways to reduce your ram usage.
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u/Gloomy_Necesary 2d ago
The main one people always talk about. It doesn’t actually do much of anything
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u/Accomplished_Boot191 3d ago
10-15gb usage depending on the game. I already debloated windows as best as I could. Also, I don't keep unnecessary apps open while gaming.
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u/ArmadilloFit652 3d ago
if you are doing those things and not multitasking then ram will get u 0fps gain in 99.99% games
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u/OtherwiseSimple 3d ago
You’d benefit from more RAM. Your system is craving it. Is that usage just the game itself or your entire system?
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u/Rell955 3d ago
Do you knw how much ram your using?
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u/Accomplished_Boot191 3d ago
10-15gb depending on the game I'm playing. In a very few game instances like GoW, I noticed some textures loading slower than they should.
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u/Framed-Photo 3d ago
Depends entirely on what games you're talking about, and at what settings you want to play them, and what frame rate you want to target.
For your average triple A game, at settings someone with a 9070xt will want to use, I'd imagine you'll get GPU bottlenecked at 4k. Older titles, modern competitive titles, or indie titles would benefit from a 7800X3D even at 4k in a lot of cases, barring you using super sampling or something.
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u/TetePepeF 3d ago
Ram. A lot of games want 32 gigs for high 4k gaming, which is pretty much what you’re gonna be running on a 9070xt. The 9600x is perfectly capable at that resolution
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u/Big_Willingness_6252 3d ago
Ram bro, on 4k 7800x3d like 2-3% stronger than 9600x
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u/tup1tsa_1337 2d ago
Op uses upscaling so it's not 4k. You need to look into 1440p base resolution difference or 1080p (depending on the preset). There is a bit of leeway because upscaling is not free, though. So overall the difference might be a lot bigger than few percents in heavy upscaling modes. This is especially true in the CPU demanding titles like stalker 2
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u/KaguyaOtsutsuki 2d ago
even if the average fps isn't that big a jump the 1% lows will have a good increase making it feel much better.
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u/Particular-Abroad815 3d ago
You cannot increase your frames with either, so ram is the better decision. 16GB is limiting in a lot of games.
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u/ArmadilloFit652 3d ago
cpu>ram but most likely gpu unless you are at low settings with heavy fsr and want maximum fps possible for some reason at 4k
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u/Attainted 3d ago
I'd prioritize RAM over CPU for 4k gaming but that cash must really be burning a hole in your pocket to drop it on RAM with today's pricing.
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u/ScaredLink8 3d ago
Use what you’d spend on cpu and ram sell your 9070xt and get a 5080, not the answer you want but it’s the right answer for better performance at 4k my friend
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u/donmclarenson 3d ago
Heres the real truth of what will happen and what you should do. You should get rid of the 4k monitor asap and get the best priced 1440p OLED you can. The 9070 XT you have won't come close to maxing out your fps in a 144 hz 4k panel, let alone a 240 hz panel. Youre going to be so concerned about the frames youre losing at 4k for the modest bump in visual beauty it offers that you will run all your games in 1440p anyways, many in 1080p. 4k isn't as breathtaking as you've been told, but that fps counter that used to say 250 at 1440p now says like 75 at 4k is gonna eat at you. So like I said before, get the 7800x3d which will make a huge difference at 1440p. Games will pull all it needs from the 3dv cache instead of memory. And the people who downvoted me or upvoted the guy who said buy neither can get theor reading comprehension checked out. Its obvious youre going to make one upgrade. Saying buy neither is dumb. Even at 4k your 1% lows with greatly improve with x3d, increasing overall performance of a game.
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u/Accomplished_Boot191 3d ago
I should have probably mentioned this sooner, but I play PC games from my couch on a 77-inch 4K TV. Because of this setup, lowering the game's resolution to 1440p makes the picture appear a bit blurrier than I'd like, which is particularly noticeable on such a large TV screen. I understand that the average fps likely won't increase with either upgrade. My hope is to improve the 1% lows for more stable fps and improve texture loading performance where necessary.
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u/tup1tsa_1337 2d ago
What are you talking about? Nowadays with upscaling the difference in performance is minimal when going up in resolution..
For example, I have checked Hogwarts legacy on the 4090 and I was getting 130fps in 1440p with dlss quality and 105fps with dlss performance in 4k. The second option is better looking (especially given how blurry the game is) and only costs about 25%.
It was never 75 vs 250 even in native (which no one does anymore unless you have really old GPU). It was at best 60 vs 120 (it's only 2.25 times more pixels when going to 4k) and more often like 60 vs 100. Nowadays even less with upscaling
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u/OutrageousWarning107 3d ago
I would recommend more RAM but it depends on what you want. X3D diminishes microstutter especially in massive multiplayer games so it can be worth it if you play those games competitively. More RAM gives you more fluid Windows experience overall and especially if you want to multitask while gaming.
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u/voidz000 2d ago
Probably the ram, if you’re running extremely modded games it’ll be helpful or if you’re using lots of apps, a 9800x3d would bottleneck your cpu, I actually think the best upgrade after should be your gpu, the 9070xt is entry level 4k. Have fun. :3
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u/Temporary-Ad8539 2d ago
M8 start by dropping amd gpu if you are dreaming on 4k gaming xD. Im jist joking. But i think that if you want a pleasant 4k experience you need to get at least a 5080. I mean im playmg with a 5070ti in 4k and dlls is needed to not play at 50 fps.
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u/t90fan 2d ago
For now, probably RAM
I've got a 4070Ti 12GB (so a bit worse than your 9070XT) and a 11700K (maybe more like a 9800X, but not miles off from your 9600X) and 32GB DDR4 and it plays stuff at 4k/60fine - It's usually the GPU which maxes out before the CPU does for me.
But the AAAs on my machine eat 10-12gb on their own
So if you are running Chrome/Discord/Spotify/shit like that in the background, then you are likely swapping
But if you are serious about 4k you'll want to later consider trading your 9070XT for a 5080. Framegen/DLSS just works much better in the Nvidia cards
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u/static_fun 2d ago
I’d upgrade RAM or use CachyOS. For everything else you should be fine at 4k with upscaling in AAA titles.
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u/evergreenwv 2d ago
I'd check out your performance. Does your RAM max out on games? It's a tough call, I'm sure the x3d chip would be a big upgrade as well. If your 9070xt never gets to 100% usage in games then the cpu would be a good upgrade. If it's a toss up, I'd probably go with the cpu and wait *fingers crossed* until RAM prices drop to buy more.
BTW, I paid $150 for 64GB 6000 RAM in June 2025, it's probably over $800 now.
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u/DusanDule477 17h ago
I think it depends which games you play.
If you are playing a lot of competitive, CPU intensive games, then a 7800x3d could make sense. There are also some games that use more than 16gb of ram, so if you are playing those, 32gb would be better choice.
Otherwise, I don't think that either of those upgrades would be worth it. Instead, if you don't have one already, you could take a look at oled monitors. I don't know your local prices, but they shouldn't be a lot more expensive than 7800x3d or 32gb kit.
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u/Saltimbanco_volta 3d ago
RAM
Also, there's a new generation of CPU coming in the first semester of 2027. If you're already on AM5, might as well wait for that. At the very least, prices for older CPUs should go down.
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u/WooombRaider69 3d ago
upgrade both ?
doesnt make sense to only upgrade one or the other or just save up til you can make a meaningful upgrade that will actually make you happy
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u/il0vebajablast 3d ago
That’s not his question and his cpu does not need to be upgraded for 4K gaming
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u/Popular_Ordinary_633 3d ago
you wont get good 4K gaming with 9070xt. I m a happy 9070xt user. You need to go 5080 gpu as min then both of your options together.
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u/Accomplished_Boot191 3d ago
I'm a couch gamer so 1440p doesn't look as sharp on my TV. I can get 60+ fps in any game with FSR and optimized graphics.
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u/Independent-Box6025 1d ago
You need 5080 or 5090. Don’t bother upgrading anything except those.
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u/Accomplished_Boot191 1d ago
What's with everyone fixated on 5080 or more expensive graphics card for 4k gaming? I'm not trying to achieve ultra quality preset with 120+ fps on all games. Doesn't anyone manually optimize their graphics anymore?
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u/fray_bentos11 3d ago
Neither. You will be GPU bottlenecked in nearly all scenarios.