G3D Mark is a standard benchmark that measures graphics performance in real-world gaming scenarios. It simplifies comparing cards from different brands, where higher scores directly correlate with better fps and smoother gaming experiences.

Head-to-Head Verdict, Benchmarks, Value & Long-Term Outlook

This comparison brings together gaming FPS, raw graphics performance, VRAM, feature set, power efficiency, pricing context, and long-term value so you can see which GPU actually makes more sense.

GeForce GTX 580M

2011

Why buy it

✅100% more VRAM for high-resolution textures and newer games (2 GB vs 1 GB).
✅Draws 100W instead of 200W, a 100W reduction.
✅More future proof: Fermi 2.0 (2010−2014) on 40nm with a newer platform for upcoming games.

Trade-offs

❌Very weak future-proofing: 2011-era hardware with 2 GB of VRAM is already obsolete for modern gaming and is hard to recommend today.
❌Lower G3D Mark per dollar, at 0 vs 12.5 G3D/$ (Unknown MSRP vs $150 MSRP).

GeForce GTX 645

2010

Why buy it

✅Delivers 100+% more G3D Mark for each dollar spent, at 12.5 vs 0 G3D/$ ($150 MSRP vs Unknown MSRP).

Trade-offs

❌Less VRAM, with 1 GB vs 2 GB for high-resolution textures and newer games.
❌Very weak future-proofing: 2010-era hardware with 1 GB of VRAM is already obsolete for modern gaming and is hard to recommend today.
❌100% higher power demand at 200W vs 100W.

GeForce GTX 580M

2011

GeForce GTX 645

2010

Why buy it

✅100% more VRAM for high-resolution textures and newer games (2 GB vs 1 GB).
✅Draws 100W instead of 200W, a 100W reduction.
✅More future proof: Fermi 2.0 (2010−2014) on 40nm with a newer platform for upcoming games.

Why buy it

✅Delivers 100+% more G3D Mark for each dollar spent, at 12.5 vs 0 G3D/$ ($150 MSRP vs Unknown MSRP).

Trade-offs

❌Very weak future-proofing: 2011-era hardware with 2 GB of VRAM is already obsolete for modern gaming and is hard to recommend today.
❌Lower G3D Mark per dollar, at 0 vs 12.5 G3D/$ (Unknown MSRP vs $150 MSRP).

Trade-offs

❌Less VRAM, with 1 GB vs 2 GB for high-resolution textures and newer games.
❌Very weak future-proofing: 2010-era hardware with 1 GB of VRAM is already obsolete for modern gaming and is hard to recommend today.
❌100% higher power demand at 200W vs 100W.

Quick Answers

So, is GeForce GTX 645 better than GeForce GTX 580M?

Yes, but this is not really about a huge raw performance gap. The broader synthetic picture is also very close at 1,878 vs 1,880 in G3D Mark. The bigger reason to prefer GeForce GTX 645 is the overall package: you are getting no meaningful modern upscaling stack.

Which one is more future-proof for 2026 and beyond?

GeForce GTX 580M is the more future-proof choice for 2026 and beyond. You are getting a newer 2011 generation instead of 2010 and more VRAM at 2 GB instead of 1 GB. That extra memory headroom makes it the safer pick for newer games, heavier textures, and higher settings over time.

Which one is the smarter buy today, not just the cheaper card?

GeForce GTX 645 can still make sense if you find it at the right price, especially around $150 MSRP. GeForce GTX 645 is still the smarter buy for most people, though, because the raw performance is close while the overall package is cleaner. GeForce GTX 645 is priced in an unclear MSRP range at $150 MSRP versus an unclear MSRP, and you are getting 0.1% higher G3D Mark. GeForce GTX 580M is the newer 2011 card, so it still has a real case if you care more about newer architecture, lower power draw (100W vs 200W), and future-proofing than about squeezing out the strongest gaming value today.

When does GeForce GTX 580M make more sense than GeForce GTX 645?

Yes. GeForce GTX 580M is still an excellent gaming GPU in 2026: it is still comfortable for 1080p and decent for 1440p, though 4K is more situational. It makes more sense if your priority is newer architecture, lower power draw (100W vs 200W), future-proofing, and staying closer to an unclear MSRP more than squeezing out the extra headroom of GeForce GTX 645. The trade-off is that GeForce GTX 645 currently gives you 0.1% higher G3D Mark. It also leads G3D-per-dollar by 100+%.

Games Benchmarks

Real-world benchmarks and performance projections based on comprehensive hardware analysis and comparative metrics. Values represent expected performance on High/Ultra settings at 1080p, 1440p, and 4K. Modeled using a Ryzen 7 9800X3D reference profile to minimize specific CPU bottlenecks.

Note: Performance behavior can vary per game. Specific architectures may perform better or worse depending on game engine optimizations and API implementation.

GeForce GTX 580M Benchmark Check

GeForce GTX 645 Benchmark Check

Path of Exile 2

Preset	GeForce GTX 580M	GeForce GTX 645
1080p
low	41 FPS	66 FPS
medium	33 FPS	54 FPS
high	20 FPS	38 FPS
ultra	13 FPS	26 FPS
1440p
low	23 FPS	52 FPS
medium	16 FPS	43 FPS
high	9 FPS	27 FPS
ultra	6 FPS	18 FPS
4K
low	10 FPS	20 FPS
medium	8 FPS	19 FPS
high	5 FPS	12 FPS
ultra	4 FPS	10 FPS

Open GeForce GTX 580M Open GeForce GTX 645

Path of Exile 2

Path of Exile 2

Counter-Strike 2

Preset	GeForce GTX 580M	GeForce GTX 645
1080p
low	85 FPS	85 FPS
medium	68 FPS	62 FPS
high	56 FPS	50 FPS
ultra	38 FPS	38 FPS
1440p
low	53 FPS	49 FPS
medium	38 FPS	33 FPS
high	29 FPS	23 FPS
ultra	20 FPS	18 FPS
4K
low	22 FPS	23 FPS
medium	15 FPS	16 FPS
high	12 FPS	12 FPS
ultra	8 FPS	9 FPS

Open GeForce GTX 580M Open GeForce GTX 645

Counter-Strike 2

Counter-Strike 2

League of Legends

Preset	GeForce GTX 580M	GeForce GTX 645
1080p
low	85 FPS	85 FPS
medium	68 FPS	68 FPS
high	56 FPS	56 FPS
ultra	42 FPS	42 FPS
1440p
low	63 FPS	63 FPS
medium	51 FPS	51 FPS
high	42 FPS	42 FPS
ultra	32 FPS	32 FPS
4K
low	42 FPS	42 FPS
medium	34 FPS	34 FPS
high	28 FPS	28 FPS
ultra	21 FPS	21 FPS

Open GeForce GTX 580M Open GeForce GTX 645

League of Legends

League of Legends

Valorant

Preset	GeForce GTX 580M	GeForce GTX 645
1080p
low	85 FPS	85 FPS
medium	68 FPS	68 FPS
high	56 FPS	56 FPS
ultra	42 FPS	42 FPS
1440p
low	63 FPS	63 FPS
medium	51 FPS	51 FPS
high	42 FPS	42 FPS
ultra	32 FPS	32 FPS
4K
low	42 FPS	42 FPS
medium	34 FPS	34 FPS
high	28 FPS	28 FPS
ultra	21 FPS	21 FPS

Open GeForce GTX 580M Open GeForce GTX 645

Valorant

Valorant

Check FPS for your specific build

Technical Specifications

Side-by-side comparison of GeForce GTX 580M and GeForce GTX 645

GeForce GTX 580M

The GeForce GTX 580M is manufactured by NVIDIA. It was released in June 28 2011. It features the Fermi 2.0 architecture. The core clock speed is 620 MHz. It has 384 shading units. The thermal design power (TDP) is 100W. Manufactured using 40 nm process technology. G3D Mark benchmark score: 1,878 points.

GeForce GTX 645

The GeForce GTX 645 is manufactured by NVIDIA. It was released in May 31 2010. It features the Fermi architecture. The core clock speed is 607 MHz. It has 352 shading units. The thermal design power (TDP) is 200W. Manufactured using 40 nm process technology. G3D Mark benchmark score: 1,880 points. Launch price was $279.

⚡

Graphics Performance

The GeForce GTX 580M scores 1,878 and the GeForce GTX 645 reaches 1,880 in the G3D Mark benchmark — just a 0.1% difference, making them near-identical in rasterization performance. The GeForce GTX 580M is built on Fermi 2.0 while the GeForce GTX 645 uses Fermi, both on a 40 nm process. Shader units: 384 (GeForce GTX 580M) vs 352 (GeForce GTX 645). Raw compute: 0.9523 TFLOPS (GeForce GTX 580M) vs 0.8554 TFLOPS (GeForce GTX 645).

Feature	GeForce GTX 580M	GeForce GTX 645
G3D Mark Score	1,878	1,880
Architecture	Fermi 2.0	Fermi
Process Node	40 nm	40 nm
Shading Units	384+9%	352
Compute (TFLOPS)	0.9523 TFLOPS+11%	0.8554 TFLOPS
ROPs	32	32
TMUs	64+45%	44
L1 Cache	512 KB	704 KB+38%
L2 Cache	512 KB	512 KB

✨

Advanced Features (DLSS/FSR)

Feature	GeForce GTX 580M	GeForce GTX 645
Upscaling Tech	Upscaling support	Upscaling support
Frame Generation	Not Supported	Not Supported
Ray Reconstruction	No	No
Low Latency	NVIDIA Reflex	NVIDIA Reflex

💾

Video Memory (VRAM)

The GeForce GTX 580M comes with 2 GB of VRAM, while the GeForce GTX 645 has 1 GB. The GeForce GTX 580M offers 100% more capacity, crucial for higher resolutions and texture-heavy games. Bus width: 256-bit vs 128-bit.

Feature	GeForce GTX 580M	GeForce GTX 645
VRAM Capacity	2 GB+100%	1 GB
Memory Type	GDDR5	GDDR5
Memory Bandwidth	96 GB/s	Unknown
Bus Width	256-bit+100%	128-bit
L2 Cache	512 KB	512 KB

🖥️

Display & API Support

DirectX support: 12 (11_0) (GeForce GTX 580M) vs 11.0 (GeForce GTX 645). Vulkan: 1.2 vs 1.2. OpenGL: 4.0 vs 4.6. Maximum simultaneous displays: 2 vs 3.

Feature	GeForce GTX 580M	GeForce GTX 645
DirectX	12 (11_0)+9%	11.0
Vulkan	1.2	1.2
OpenGL	4.0	4.6+15%
Max Displays	2	3+50%

🎬

Media & Encoding

Hardware encoder: PureVideo HD VP4 (GeForce GTX 580M) vs NVENC (1st Gen) (GeForce GTX 645). Decoder: PureVideo HD VP4 vs PureVideo VP5. Supported codecs: H.264,VC-1,MPEG-2,MPEG-4 ASP (GeForce GTX 580M) vs MPEG-2,VC-1,H.264,MPEG-4 (GeForce GTX 645).

Feature	GeForce GTX 580M	GeForce GTX 645
Encoder	PureVideo HD VP4	NVENC (1st Gen)
Decoder	PureVideo HD VP4	PureVideo VP5
Codecs	H.264,VC-1,MPEG-2,MPEG-4 ASP	MPEG-2,VC-1,H.264,MPEG-4

🔌

Power & Dimensions

The GeForce GTX 580M draws 100W versus the GeForce GTX 645's 200W — a 66.7% difference. The GeForce GTX 580M is more power-efficient. Recommended PSU: 350W (GeForce GTX 580M) vs 300W (GeForce GTX 645). Power connectors: 1x 6-pin vs None. Typical load temperature: 95°C vs 80.

Feature	GeForce GTX 580M	GeForce GTX 645
TDP	100W-50%	200W
Recommended PSU	350W	300W-14%
Power Connector	1x 6-pin	None
Length	—	147mm
Height	—	111mm
Slots	0-100%	1
Temp (Load)	95°C	80-16%
Perf/Watt	18.8+100%	9.4