FireStream 9250 vs GeForce GT 640 Rev. 2

The FireStream 9250 scores 1,165 and the GeForce GT 640 Rev. 2 reaches 1,168 in the G3D Mark benchmark — just a 0.3% difference, making them near-identical in rasterization performance. The FireStream 9250 is built on TeraScale while the GeForce GT 640 Rev. 2 uses Kepler 2.0, both on 55 nm vs 28 nm. Shader units: 800 (FireStream 9250) vs 384 (GeForce GT 640 Rev. 2). Raw compute: 1 TFLOPS (FireStream 9250) vs 0.8033 TFLOPS (GeForce GT 640 Rev. 2).

The GeForce GT 640 Rev. 2 gets NVIDIA DLSS, which still tends to look cleaner in motion. The FireStream 9250 leans on FSR, which is flexible and widely supported, but usually a bit rougher at the same settings.

The FireStream 9250 has 1 GB of VRAM, while the GeForce GT 640 Rev. 2 carries 512 MB. FireStream 9250 gives you 100% more memory capacity, which matters more once you move into heavier textures, mods, or higher resolutions. Memory bus width is 64-bit on the FireStream 9250 and 64-bit on the GeForce GT 640 Rev. 2. L2 Cache: 256 KB (FireStream 9250) vs 128 KB (GeForce GT 640 Rev. 2) — the FireStream 9250 has significantly larger on-die cache to reduce VRAM reliance.

DirectX support: 10.1 (FireStream 9250) vs 12 (11_0) (GeForce GT 640 Rev. 2). Vulkan: N/A vs 1.2. OpenGL: 3.3 vs 4.6. Maximum simultaneous displays: 1 vs 3.

Hardware encoder: None (FireStream 9250) vs NVENC (Kepler) (GeForce GT 640 Rev. 2). Decoder: UVD 2.0 vs PureVideo HD 5. Supported codecs: H.264,VC-1 (FireStream 9250) vs H.264,MPEG-2,VC-1 (GeForce GT 640 Rev. 2).

The FireStream 9250 draws 150W versus the GeForce GT 640 Rev. 2's 49W — a 101.5% difference. The GeForce GT 640 Rev. 2 is more power-efficient. Recommended PSU: 350W (FireStream 9250) vs 300W (GeForce GT 640 Rev. 2). Power connectors: PCIe-powered vs None. Card length: 234mm vs 145mm, occupying 1 vs 1 slots. Typical load temperature: Unknown vs 65.

At launch, the FireStream 9250 came in at $999, while the GeForce GT 640 Rev. 2 launched at $99. On MSRP, GeForce GT 640 Rev. 2 was 90.1% cheaper ($900 less). Performance per dollar on MSRP (G3D Mark / MSRP): 1.2 (FireStream 9250) vs 11.8 (GeForce GT 640 Rev. 2) — the GeForce GT 640 Rev. 2 offers 883.3% better value. The newer card here is GeForce GT 640 Rev. 2 (2013 vs 2008).

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