GeForce RTX 4090 48GB Price & Used Prices: Which Local LLMs Can It Run?

• Memory48 GB · GDDR6X
• Bandwidth1,008 GB/s
• FP16 / BF16330.3 TFLOPS
• FP8 / INT8660.6 / 660.6 TOPS

Bus width

384-bit

Architecture

Ada Lovelace (AD102)

Cores

16,384

Tensor cores

512

Ecosystem

CUDA

Interface

PCIe 4.0 x16

NVLink

Not supported

Power

450 W

Power connector

16-pin 12VHPWR

Slots

2

Type

Consumer

Launch date

Oct 12, 2022

Model	Size	Cards	Total price	Total VRAM	Speed t/s	Total power
Qwen3.8 Flash Next176B (6B active)	111.3 GB	4 cards	No price	192 GB	98.8	1,800 W
DeepSeek V4 Flash284B (13B active)	155.1 GB	4 cards	No price	192 GB	71.4	1,800 W
Hy3295B (21B active)	182.2 GB	8 cards	No price	384 GB	35.4	3,600 W
GLM 5.3 Flash320B (18B active)	199.7 GB	8 cards	No price	384 GB	51.4	3,600 W

Full calculation rules are on the Methodology page.

1. 1

   How it's made

   On the original 4090, memory sits only on the front of the board. Modders move the GPU onto a new circuit board that can carry memory chips on both sides (with a layout close to the RTX 3090's), fit twelve 2GB chips on each side, then flash a BIOS modified for the new capacity. hardware-corner believes the modders used leaked internal NVIDIA tools that leave the BIOS signature intact, which is why the official driver recognizes 48GB.

2. 2

   Rear memory temperature

   Half the memory is on the back of the board, cooled only by the backplate. In a review by the Russian channel МК, the GPU ran at about 70°C while the memory hit 86°C, the hottest part of the card. When it arrives, run it at full load for ten minutes and check memory temperature in HWiNFO; once it's in the case, ideally have some airflow over the backplate side.

3. 3

   Noise, power and slots

   The reviewed card is a dual-slot, single-fan blower, which suits multi-GPU setups with cards side by side. The trade-off is noise, peaking at about 65 dB during benchmarks, which is very noticeable under a desk. Power comes through a 16-pin 12VHPWR connector; plan your power supply for 450W.

4. 4

   Sourcing and warranty

   Sourcing varies by seller: the reviewed card's GPU showed signs of prior use while its memory chips were new and from a single batch, whereas a personal mod reported by PC Gamer used old memory on hand. There's no NVIDIA or board-partner warranty, so you rely on the seller; ask about the warranty period and whether you can return the card if it fails your tests. All 24 memory chips have been resoldered, so a memtest_vulkan run must cover the full 48GB; testing only part of it won't catch bad chips.

Spec	GeForce RTX 4090 48GB	GeForce RTX 4090D 48GB	RTX 6000 Ada	RTX PRO 5000 48GB
Memory	48 GB	48 GBSame	48 GBSame	48 GBSame
Bandwidth	1,008 GB/s	1,008 GB/sSame	960 GB/s5% lower	1,344 GB/s33% higher
BF16 / FP16 compute	330 TFLOPS	294 TFLOPS11% lower	364 TFLOPS10% higher	258 TFLOPS22% lower
INT8 compute	661 TOPS	589 TOPS11% lower	729 TOPS10% higher	516 TOPS22% lower
Qwen3.8 27B speed (2-bit)	69.3 t/s	69.3 t/sSame	66.3 t/s4% slower	89.5 t/s29% faster
Largest dense model (4-bit)	79B	79BSame	79BSame	79BSame
Power	450 W	425 W6% lower	300 W33% lower	300 W33% lower
Interface	PCIe 4.0 x16	PCIe 4.0 x16	PCIe 4.0 x16	PCIe 5.0 x16
Released	2022-10	2023-12	2022-09	2025-03
eBay median	View on eBayView on eBay · GeForce RTX 4090 48GB	View on eBayView on eBay · GeForce RTX 4090D 48GB	$7,941Buy RTX 6000 Ada	$7,900Buy RTX PRO 5000 48GB

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