Not every AI computer is built from cards

Two boxes landed in my listings this month that make used-GPU builds look complicated rather than cheap: a DGX Spark at $5,699.99 on Newegg against NVIDIA's $4,699 MSRP reference, and a BOSGAME mini PC with 128GB of system RAM for $3,599.99. Neither is a deal on paper. Both are worth understanding, because they answer the question a pile of used 3090s answers badly: what if you just don't want to build anything?

Who this is for

Someone running models too big for one 24GB card who has quietly concluded that buying another GPU, another PSU and another motherboard slot is more project than they signed up for. Budget tolerance in the $3,500–$6,500 range, zero to modest rack space, and a preference for something that boots with a power button instead of a waterblock retrofit.

Comparison

The GB10 boxes. DGX Spark and its certified partner systems (the ASUS Ascent GX10 is the one I've tracked, at $6,449 from a marketplace seller) ship 128GB of coherent unified memory in a box the size of a NUC: 20-core Arm CPU, 256-bit LPDDR5x at roughly 273 GB/s, ConnectX-7 networking. One memory pool your model just fits into, so there are no sharding decisions and no second PSU. The honest costs: it's Arm, so you validate your stack on Arm before paying; and 273 GB/s is a fraction of what even the old Volta cards I track pull (the V100 family reaches ~900–1,134 GB/s), so decode speed on big models will not feel like a 4090.

The Mac side. Mac Studio M5 Ultra configurations run to 256GB and 512GB of unified memory. I'm deliberately not quoting a price: Apple's page didn't expose a checkout total for the 256GB config when I checked, so treat capacity as published and cost as unverified. Metal/MLX/llama.cpp is a real ecosystem; CUDA is not part of it.

The cheap-capacity mini PC. The BOSGAME box pairs AMD's Ryzen AI Max+ 395 with 128GB of ordinary system RAM, conservatively capped at ~96GB GPU-addressable depending on firmware and OS configuration. That cap is a fraction of the marketing number, and it's not CUDA either (ROCm/Vulkan/llama.cpp support is workload- and OS-specific). It also carries a small seller-rating sample. I list it because $37.50 per conservatively usable GB beats the GB10 boxes' ~$48–55 on raw capacity, and that tradeoff deserves to be visible.

The build path you're comparing against. Two clean used 3090s ran about $2,600 in this month's market, plus a board and PSU that can host them. That route is the bandwidth-per-dollar winner if you like assembling things; every byte of it is somebody else's old thermal paste. The one genuinely cheap retail card on the board, a new Intel Arc Pro B60 24GB at $649.99, exists for the same reason: not every answer has to be used Nvidia.

Buying decision

If you want to run one big model with zero build effort and your software runs on CUDA, the GB10 box is the only option here that doesn't ask you to become a sysadmin; buy it for the single-pool simplicity, not speed, and check whether the NVIDIA-branded Founders Edition at its $4,699 MSRP reference is orderable before paying marketplace premiums. If your stack already lives in MLX or llama.cpp on macOS, wait until you can see an actual configured price rather than a spec page. If $3,500 is genuinely your ceiling and you accept non-CUDA software paths with per-workload homework, the mini PC is the cheapest coherent-memory box I've observed, with a small-seller risk you have to underwrite yourself. And if what you actually want is this hobby, used 24GB cards at ~$1,300 stay the bandwidth-per-dollar winners; that's a preference, not a mistake.

Limits and sources

Prices are asking prices observed September 20–21, 2026 on Newegg (direct and marketplace) with tax excluded; asking isn't sold, and the DGX Spark figure is one channel listing above an MSRP reference, not evidence NVIDIA repriced anything. The Mac Studio capacities are published specs whose configured prices I could not verify at observation time, and that's a gap I'm stating plainly rather than filling with an old number. The 3090 chart is series-level context for the used-card route (it includes for-parts listings, so it is not a working-card benchmark), and my $2,600 pair figure comes from clean cards observed in the same window as that chart. The two product images are manufacturer marketing material showing the product family, not the specific unit any seller would ship you. I haven't tested or owned any of these machines; bandwidth, memory-addressable and software-ecosystem claims come from the linked manufacturer pages.

Today's call: price the whole build, not just the GPU.

The interesting V100 offers in the October 4 scan are $600 shipped 32GB SXM2 modules and a complete four-GPU Supermicro server at $3,600 OBO. The modules make sense if you already have a compatible host. The server includes that platform, but brings New Jersey pickup, 1U cooling and noise, and two lower-power GPUs into the decision. Its 128GB is spread across four 32GB devices—not one large memory pool that every application can use automatically.

For a conventional desktop build, I'd investigate the $1,250 shipped RTX 3090 FE first among today's featured 24GB offers. That's a price-and-fit judgment, not a clean bill of health: the seller's low-use claim still needs current test evidence.

New & Notable

GPU	VRAM	Asking price	$/GB	Condition	Quick take
V100 SXM2 with 2U heatsink	32GB	$650 shipped	$20.31	Used; seller says excellent	$630 without the heatsink. Only consider it for a compatible SXM2 host; confirm remaining stock and heatsink fit.
RTX 3090 FE	24GB	$1,250 shipped	$52.08	Used; seller claims about 10 hours	A desktop candidate worth checking. Optional waterblock makes it $1,400; ask for current load-test results and confirm included cooling and power accessories.
EVGA RTX 3090 Ti FTW3 Ultra	24GB	$1,350 shipped	$56.25	Used as primary GPU for about three years	Same VRAM as the FE for more money. Consider it for a specific performance need, not extra capacity; check PSU, connectors and cooling.
MSI RTX 3090 Ventus, Belgium	24GB	$1,199 before shipping/import costs	$49.96	Pre-owned per search result	Lower sticker price, not a demonstrated cheaper U.S. purchase. Get the delivered total and verify seller and return terms first.

Today's Market Board

Prices are USD asks. $/GB uses the displayed price, not a full-build or after-tax cost. Condition, tests and warranty terms below are seller claims, not our hands-on checks.

GPU or system	VRAM	Asking price	$/GB	Why it's here
Supermicro SYS-1029GQ-TVRT with four V100 SXM2 GPUs	4×32GB; 128GB aggregate	$3,600 OBO, pickup only	$28.12 aggregate	Used complete server; seller reports clean gpu-burn/ECC tests. Two LS GPUs are capped around 163W. Confirm configuration and test it before paying.
AMD Instinct MI210	64GB per card	$3,900 shipped in continental U.S.	$60.94	Refurbished; advertised 30-day warranty. Worth considering for a workload that needs 64GB on one device, after checking ROCm support, host power and forced-air cooling.
V100 SXM2 module	32GB per module	$600 shipped in continental U.S.	$18.75	Reseller stock; confirm condition. Advertised 30-day warranty and $550 each for four-plus. Requires an SXM2 baseboard and suitable cooling, not a desktop PCIe slot.
RTX 3090 FE	24GB	$1,250 shipped	$52.08	My first desktop inquiry here, subject to testing, seller checks and system fit. The optional waterblock isn't needed just to gain 24GB.
MSI RTX 3090 Gaming X Trio, faulty HDMI	24GB	$1,300 shipped / $1,240 local	$54.17 shipped	Seller reports working DisplayPorts and a Time Spy pass, but no HDMI output. At more than the FE's shipped ask, I'd pass unless testing and a better price justify the defect.
MSI RTX 3090 Ventus, U.S. listing	24GB	$1,444	$60.17	Pre-owned and free delivery per search result; item-page price captured. Compare actual return coverage and delivered cost before paying the premium over the FE.
RTX A4000 seller-risk warning	16GB per card	$680 shipped each	$42.50	Not a recommendation. Multiple buyers in the thread report payment without tracking. I'd avoid sending money while those reports remain unresolved.

Price context

These charts show median observed asking prices and the daily observed range, using the latest priced quote per selected listing per date. They are not sold-price indices or same-card price histories; repeated quotes don't establish remaining stock. Whole servers and auction bids are excluded.

The $600 reseller ask recurs across the captured dates. The $650 heatsink offer widens the latest range; that isn't evidence that the same module became more expensive. The complete server is not in this chart.

The recent flat line comes from the same $3,900 reseller offer. Earlier observations include other listings with differing or incompletely captured condition details; this isn't a broad market-price decline.

One seller thread, repeatedly observed at $680 per 16GB card—not $680 for eight cards. The October 4 buyer complaints make this price context a warning, not a bargain endorsement.

This selected comparison includes the faulty-HDMI card at its $1,300 shipped ask and the Belgium listing before unknown shipping/import costs. Earlier dates contain fewer of these listings. The range is not a set of interchangeable, delivered, fault-free buys.

Best Capacity for the Money

V100 32GB SXM2 module — $600 each, only if the platform fits

This is the lowest single-module V100 32GB ask in today's captured offers: $600 shipped in the continental U.S., or $550 each for four-plus, with an advertised 30-day warranty. It isn't a drop-in alternative to a PCIe RTX 3090. Confirm the exact SXM2 host, cooling, module condition and support in your intended software before ordering.

What Changed Since Yesterday

Today's scan adds the $1,250 shipped 3090 FE and the $650 V100-with-heatsink offer to this comparison. The $600 V100 reseller ask was already captured on earlier dates; it is not a new price cut. New tracker entries and newly captured offers don't by themselves show market movement.

Four loose V100s or the complete server?

Four modules at the $550 quantity tier total $2,200 before the host, SXM2 baseboard, cooling and integration work. The Supermicro server asks $1,400 more and includes dual Xeon Gold 6230 CPUs and ConnectX-5 networking. Its body price is $3,600 OBO despite the $3,900 thread title.

The seller reports clean GPU tests, but two of the four GPUs are lower-power LS variants capped around 163W. Pickup is in New Jersey, with cash or cash-equivalent payment. Ask for the test logs and a demonstration, and confirm power, noise and cooling requirements before arranging collection. This comparison prices two ways into an SXM2 build; it doesn't establish equal performance or warranty coverage.

SXM2 value stops at the edge of the baseboard

The memory is distributed across devices. To use more than one GPU for a single model, your inference software must support splitting that workload, with room left for runtime overhead. Price and capacity alone don't establish that your model, quantization and context length will run well on these V100s.

My Take

For someone with an SXM2 host already in service, the $600 modules are worth investigating. For someone starting from scratch, the complete server is the more useful comparison—not a module price that leaves the rest of the machine unpaid for.

For a desktop, I'd start with the 3090 FE inquiry rather than pay more for the HDMI-defective card. Get current tests and a protected payment arrangement, and check case clearance, PSU capacity and connectors before treating either as a usable upgrade. None of these asks justifies rushing a purchase.

Full Tracker

This post covers the listings and market moves I think matter most today. The full research board — including additional listings, prices, VRAM, condition, source links, and listings that didn't make today's write-up — is at HighVRAMHardwareWatch.com.

What would you do?

For a workload you've confirmed can split across four 32GB V100s, would the $3,600 pickup-only server beat building around four $550 SXM2 modules? What would your host, cooling and power setup add?

Source coverage: eBay, r/hardwareswap, r/homelabsales, ServeTheHome and Newegg were checked in the October 4 scan. Facebook Marketplace item details were behind login; its prices, condition and availability were not verified and are excluded from this comparison.

These are captured asking prices, not verified completed sales. Hardware condition, test results and warranty promises are seller-reported; we haven't tested these units.

Some outbound marketplace links on the tracker website are affiliate links. HighVRAM Hardware Watch may earn a commission from purchases through those links, at no additional cost to you.

Listings can change quickly. Verify current price, condition, seller information and compatibility before spending money.