GeForce GT 645 vs Iris Pro Graphics P580

GeForce GT 645 vs Iris Pro Graphics P580 Performance Spectrum

GeForce GT 645

2 GB 32

2,006

0.0%

GeForce GTX 1650 Ti with Max-Q Design

GeForce GTX 980

GeForce GTX 1080

TITAN V

Iris Pro Graphics P580

Shared System RAM 15

2,026

+1.0%

Arc A530M

Arc A770M

Arc B580

About G3D Mark

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.

GeForce GT 645 vs Iris Pro Graphics P580 FPS Benchmarks

Predicted gaming performance across popular games. Tested paired with Ryzen 7 9800X3D to isolate GPU performance.

Search any supported game below to compare 1080p FPS for both components.

GeForce GT 645 vs Iris Pro Graphics P580: Pros, Cons & Final Verdict

See where each GPU makes more sense in practice: raw FPS, VRAM, features, power draw, pricing, and long-term headroom.

GeForce GT 645

2012

Why buy it

✅Costs $51 less on MSRP ($99 MSRP vs $150 MSRP).
✅Delivers 50% more G3D Mark for each dollar spent, at 20.3 vs 13.5 G3D/$ ($99 MSRP vs $150 MSRP).
✅100+% more VRAM for high-resolution textures and newer games (2 GB vs Unknown).
✅Iris Pro Graphics P580 is already obsolete for modern gaming, so GeForce GT 645 is the less risky modern option long term.

Trade-offs

❌2012 hardware with 2 GB of VRAM is already well past its comfortable zone for modern gaming, so it is hard to recommend now.
❌113.3% higher power demand at 32W vs 15W.

Iris Pro Graphics P580

2015

Why buy it

✅Draws 15W instead of 32W, a 17W reduction.
✅More future proof: Generation 9.0 (2015−2016) on 14nm with a newer platform for upcoming games.

Trade-offs

❌Less VRAM, with Unknown vs 2 GB for high-resolution textures and newer games.
❌2015 hardware with Unknown of VRAM is already well past its comfortable zone for modern gaming, so it is hard to recommend now.
❌
51.5% HIGHER MSRP
$150 MSRPvs$99 MSRP
❌Lower G3D Mark per dollar, at 13.5 vs 20.3 G3D/$ ($150 MSRP vs $99 MSRP).

Quick Answers

Which GPU is faster for gaming right now?

Iris Pro Graphics P580 is the faster gaming card right now based on the synthetic data we have. It leads by 1% in PassMark G3D (2,026 vs 2,006), which is the best performance signal available in this matchup.

Which GPU is the safer long-term pick for 2026 and beyond?

GeForce GT 645 is the safer long-term pick for 2026 and beyond. The case is simple: 2 GB vs Unknown of VRAM. That gives it more room for heavier textures and higher settings over time.

Which GPU is the better buy today?

GeForce GT 645 makes the most sense to buy today. It is $51 cheaper on MSRP at $99 vs $150, and it leads G3D-per-dollar by 50% (20.3 vs 13.5), which is enough to swing the recommendation its way. Iris Pro Graphics P580 still makes more sense if max raw gaming performance matters more than value.

GeForce GT 645 vs Iris Pro Graphics P580 Technical Specifications

Side-by-side specs, architecture details, clocks, memory, power, and platform differences.

GeForce GT 645

The GeForce GT 645 is manufactured by NVIDIA. It was released in October 1 2012. It features the Kepler architecture. The core clock speed is Up to 710 MHz. It has 384 shading units. The thermal design power (TDP) is 32W. Manufactured using 28 nm process technology. G3D Mark benchmark score: 2,006 points.

Iris Pro Graphics P580

The Iris Pro Graphics P580 is manufactured by Intel. It was released in September 1 2015. It features the Generation 9.0 architecture. The core clock ranges from 350 MHz to 1050 MHz. It has 576 shading units. The thermal design power (TDP) is 15W. Manufactured using 14 nm+ process technology. G3D Mark benchmark score: 2,026 points.

⚡

Graphics Performance

The GeForce GT 645 scores 2,006 and the Iris Pro Graphics P580 reaches 2,026 in the G3D Mark benchmark — just a 1% difference, making them near-identical in rasterization performance. The GeForce GT 645 is built on Kepler while the Iris Pro Graphics P580 uses Generation 9.0, both on 28 nm vs 14 nm+. Shader units: 384 (GeForce GT 645) vs 576 (Iris Pro Graphics P580). Raw compute: 0.5445 TFLOPS (GeForce GT 645) vs 1.21 TFLOPS (Iris Pro Graphics P580).

Feature	GeForce GT 645	Iris Pro Graphics P580
G3D Mark Score	2,006	2,026
Architecture	Kepler	Generation 9.0
Process Node	28 nm	14 nm+
Shading Units	384	576+50%
Compute (TFLOPS)	0.5445 TFLOPS	1.21 TFLOPS+122%
ROPs	16+78%	9
TMUs	32	72+125%

✨

Advanced Features (DLSS/FSR)

The GeForce GT 645 gets NVIDIA DLSS, which still tends to look cleaner in motion. The Iris Pro Graphics P580 leans on FSR, which is flexible and widely supported, but usually a bit rougher at the same settings.

Feature	GeForce GT 645	Iris Pro Graphics P580
Upscaling Tech	Upscaling support	Upscaling support
Frame Generation	Not Supported	Not Supported
Ray Reconstruction	No	No
Low Latency	NVIDIA Reflex	Standard

💾

Video Memory (VRAM)

The GeForce GT 645 has 2 GB of VRAM, while the Iris Pro Graphics P580 carries 0 MB. GeForce GT 645 gives you 100+% more memory capacity, which matters more once you move into heavier textures, mods, or higher resolutions. Memory bus width is 128-bit on the GeForce GT 645 and System on the Iris Pro Graphics P580.

Feature	GeForce GT 645	Iris Pro Graphics P580
VRAM Capacity	2 GB	Shared System RAM
Memory Type	GDDR5	Shared
Memory Bandwidth	Unknown	System
Bus Width	128-bit	System

🔌

Power & Dimensions

The GeForce GT 645 draws 32W versus the Iris Pro Graphics P580's 15W — a 72.3% difference. The Iris Pro Graphics P580 is more power-efficient. Recommended PSU: 350W (GeForce GT 645) vs 1W (Iris Pro Graphics P580). Power connectors: PCIe-powered vs Integrated.

Feature	GeForce GT 645	Iris Pro Graphics P580
TDP	32W	15W-53%
Recommended PSU	350W	1W-100%
Power Connector	PCIe-powered	Integrated
Length	145mm	—
Height	111mm	—
Slots	1	—
Temp (Load)	80	—
Perf/Watt	62.7	135.1+115%

💰

Value Analysis

At launch, the GeForce GT 645 came in at $99, while the Iris Pro Graphics P580 launched at $150. On MSRP, GeForce GT 645 was 34% cheaper ($51 less). Performance per dollar on MSRP (G3D Mark / MSRP): 20.3 (GeForce GT 645) vs 13.5 (Iris Pro Graphics P580) — the GeForce GT 645 offers 50.4% better value. The newer card here is Iris Pro Graphics P580 (2015 vs 2012).

Feature	GeForce GT 645	Iris Pro Graphics P580
MSRP	$99-34%	$150
Performance per Dollar	20.3+50%	13.5
Codename	GK107	Skylake GT4e
Release	October 1 2012	September 1 2015
Ranking	#903	#678

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