Home / Models / GPT-OSS 20B / NVIDIA RTX 5070 12 GB

Calculated memory fit · not a benchmark

Can GPT-OSS 20B run on NVIDIA RTX 5070 12 GB?

Can it run? Yes, with CPU/RAM offload. Full GPU fit? No.

Can it run?

Can it run?
Yes, with CPU/RAM offload. This is not equivalent to full-GPU inference.
Full GPU fit?
No
Model
GPT-OSS 20B · 22B
GPU
NVIDIA RTX 5070 12 GB · 12 GB advertised

Memory calculation

Breakdown for Q4 at 8K context, batch size 1. Calculator v1.0.0.

Model weights12.6 GB
KV cache0.4 GB
Runtime reserve1.1 GB
Safety margin0.6 GB
Required (estimated)14.7 GB
GPU usable VRAM10.8 GB

Result: CPU RAM OFFLOAD REQUIRED

Quantization table

Quantization2K4K8K16K32K64K128K
BF16NoNoNoNoNoNoNo
FP16NoNoNoNoNoNoNo
Q3OffloadOffloadOffloadOffloadOffloadOffloadOffload
Q4OffloadOffloadOffloadOffloadOffloadOffloadOffload
Q5OffloadOffloadOffloadOffloadOffloadOffloadOffload
Q6OffloadOffloadOffloadOffloadOffloadOffloadOffload
Q8OffloadOffloadOffloadOffloadOffloadOffloadOffload

What fits entirely in VRAM?

No calculated full-VRAM fit at the evaluated quantizations and context lengths.

What requires RAM offload?

Weights may run with CPU/RAM offload. That is not equivalent to full-GPU inference. RigForAI does not estimate tokens/sec in this release.

Available graphics cards

These SKUs use this GPU chip. Amazon CTAs appear only for EXACT/HIGH matches. Absence of a price does not change the compatibility result above.

Check price on Amazon

GIGABYTE

GIGABYTE GeForce RTX 5070 WINDFORCE OC SFF 12G Graphics Card

12 GB · Amazon EXACT

$771.37

Check price on Amazon
ASUS

ASUS Dual -RTX5070-O12G NVIDIA GeForce RTX 5070 12 GB GDDR7

12 GB · Amazon EXACT

$1466.00

Check price on Amazon
MSI

MSI GAMING GeForce RTX 5070 12G TRIO OC NVIDIA 12 GB GDDR7

12 GB · Amazon EXACT

$835.00

Check price on Amazon
GIGABYTE

GIGABYTE GeForce RTX 5070 GAMING OC 12G Graphics Card

12 GB · Amazon EXACT

$839.99

Check price on Amazon
ASUS

ASUS Prime -RTX5070-O12G NVIDIA GeForce RTX 5070 12 GB GDDR7

12 GB · Amazon EXACT

Check price on Amazon
ASUS

ASUS TUF Gaming TUF-RTX5070-O12G-GAMING NVIDIA GeForce RTX 5070 12 GB GDDR7

12 GB · Amazon EXACT

Check price on Amazon
GIGABYTE

GIGABYTE GeForce RTX 5070 EAGLE OC ICE SFF 12G Graphics Card - 12GB GDDR7, 192bit, PCI-E 5.0, 2587 MHz Core Clock, 3 x DP 2.1a, 1 x HDMI 2.1b, NVIDIA DLSS 4, GV-N5070EAGLEOC ICE-12GD

12 GB · Amazon EXACT

Check price on Amazon
GIGABYTE

GIGABYTE GeForce RTX 5070 EAGLE OC SFF 12G Graphics Card - 12GB GDDR7, 192bit, PCI-E 5.0, 2587 MHz Core Clock, 3 x DP 2.1b, 1 x HDMI 2.1b, NVIDIA DLSS 4, GV-N5070EAGLE OC-12GD

12 GB · Amazon EXACT

Check price on Amazon
MSI

MSI GeForce RTX 5070 12G VENTUS 2X OC NVIDIA 12 GB GDDR7

12 GB · Amazon EXACT

Check price on Amazon

Sources

Model: official config openai/gpt-oss-20b (main). GPU/product specs: Icecat. Compatibility: RigForAI calculator v1.0.0 estimated VRAM · Q8 at 8K: CPU_RAM_OFFLOAD_REQUIRED. Amazon: affiliate commerce match, not a spec source.