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Gaming Performance Comparison

In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GTX 645 (OEM) are marginally better than the AMD Radeon HD 7750 1GB GDDR5.

The GTX 645 has a 23 MHz higher core clock speed and 16 more Texture Mapping Units than the HD 7750. This results in the GTX 645 providing 13.9 GTexel/s better texturing performance. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.

The GTX 645 has a 23 MHz higher core clock speed than the HD 7750 and the same number of Render Output Units. This results in the GTX 645 providing 0.4 GPixel/s better pixeling performance. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

The GTX 645 was released over a year more recently than the HD 7750, and so the GTX 645 is likely to have better driver support, meaning it will be more optimized for running the latest games.

The GeForce GTX 645 (OEM) and the Radeon HD 7750 1GB GDDR5 have the same amount of video memory, but are likely to provide slightly different experiences when displaying game textures at high resolutions.

The HD 7750 has 8 GB/sec greater memory bandwidth than the GTX 645, which means that the memory performance of the HD 7750 is marginally better than the GTX 645.

The GeForce GTX 645 (OEM) has 576 Shader Processing Units and the Radeon HD 7750 1GB GDDR5 has 512. However, the actual shader performance of the GTX 645 is 511 and the actual shader performance of the HD 7750 is 369. The GTX 645 having 142 better shader performance and an altogether better performance when taking into account other relevant data means that the GTX 645 delivers a marginally smoother and more efficient experience when processing graphical data than the HD 7750.

The GeForce GTX 645 (OEM) requires 65 Watts to run and the Radeon HD 7750 1GB GDDR5 requires 55 Watts. We would recommend a PSU with at least 450 Watts for the GTX 645 and a PSU with at least 400 Watts for the HD 7750. The GTX 645 requires 10 Watts more than the HD 7750 to run. The difference is not significant enough for the GTX 645 to have a noticeably larger impact on your yearly electricity bills than the HD 7750.

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GPU Core Details

Core Speed823 MHzvs800 MHz
ArchitectureKepler GK106GCN 1.0 Cape Verde PRO
Notebook GPUnono
Release Date22 Apr 201315 Feb 2012
GPU LinkGD LinkGD Link

Resolution Performance

1366x768 - vs green tick
1600x900 - vs green tick
1920x1080 - vs green tick
2560x1440 - vs green tick
3840x2160 - vs green tick

GPU Memory

Memory1024 MBvs1024 MB
Memory Speed1000 MHzvs1125 MHz
Memory Bus128 Bitvs128 Bit
Memory TypeGDDR5vsGDDR5
Memory Bandwidth64GB/secvs72GB/sec
L2 Cache 384 KB vs green tick 512 KB

GPU Display

Shader Processing Units576vs512
Actual Shader Performance511vs369
Texture Mapping Units48vs32
Texture Rate39.5 GTexel/svs25.6 GTexel/s
Render Output Units16vs16
Pixel Rate13.2 GPixel/svs12.8 GPixel/s

GPU Display Tech

Shader Model5.0vs5.0
Open GL4.3vs4.2
Max Resolution (WxH)4096x2160vs4096x2160
VGA Connections0vs1
DVI Connections2vs1
HDMI Connections1vs1

GPU Power Requirements

Max Power65 Wattsvs55 Watts

GPU Supporting Hardware

Recommended RAM8 GBvs8 GB
Recommended Screen Size1600x9001600x900
Recommended PSU450 Watts & 30 Ampsvs400 Watts & 18 Amps

Gaming Performance Value

Performance Value

GPU Mini Review

Mini ReviewGeForce GTX 645 (OEM) is a fast-middle-class Graphics Card based on the 28nm, Kepler architecture.
Set to replace the already released, in 2012, Fermi based, GeForce GT 645, it equips a Kepler GK106 Core with 576 Shader Processing Units, 48 TMUs and 16 ROPs, on a 128-bit memory interface of fast GDDR5. The central unit runs at 823MHz (up to 888MHz, in Turbo Mode) and the memory clock operates at 1000MHz.
Benchmarks indicate its performance is only very slightly below next-in-series GeForce GTX 650, because despite featuring one extra SMx activated, GeForce GTX 650 is higher-clocked and offers more bandwidth.
Radeon HD 7750 1GB GDDR5 is a fast-middle-class GPU based on the 28nm GCN (Graphics Core Next) architecture.
It's based on Cape Verde Chip (Pro variant) and offers 512 Shader Processing Units, 32 TMUs and 16 ROPs on a 128-bit memory interface of fast GDDR5 (though some DDR3 variants were also released). The central unit is clocked at 800MHz while the memory clock operates at 1125MHz. Expect a power consumption of up to 55 Watt.
Benchmarks indicate today's modern games can be played at high settings using a 1080p resolution while most modern demanding games such as Metro 2033 will require reduced resolutions to be played optimally.
This GPU can be paired with an average Quad Core.
Recommended CPUIntel Xeon Processor E5320
AMD Athlon 64 X2 Dual Core 4800+
Intel Xeon Processor E3110
AMD Opteron 8354
Intel Core 2 Duo E4400 2.0GHz
AMD Athlon II X4 645
AMD FX-4170
AMD APU A8-6600K Quad-Core
Intel Core i3-3250 3.5GHz
AMD APU A8-7600 Quad-Core
Possible GPU Upgrades-Radeon R9 270X Sapphire Black Diamond 2GB Edition
Radeon R9 270X Sapphire Toxic 2GB OC Edition
Radeon R9 270X PowerColor Devil Edition
Radeon R9 270X MSI Hawk Edition
Radeon R9 270X MSI Gaming 4GB Edition
GPU Variants-Radeon HD 7750 Sapphire Ultimate
Radeon HD 7750 Sapphire Low Profile
Radeon HD 7750 VTX3D 1GB GDDR5 Edition
Radeon HD 7750 PowerColor 1GB Edition
Radeon HD 7750 XFX Core Edition
Radeon HD 7750 Sapphire 1GB GDDR5 Edition
Radeon HD 7750 Club3D Low Profile Edition
Radeon HD 7750 Asus 1GB Edition
Radeon HD 7750 MSI PMD1 OC Edition
Radeon HD 7750 MSI OC Edition
Radeon HD 7750 Double D Black Edition
Radeon HD 7750 Gigabyte 1GB OC Edition
Radeon HD 7750 MSI OC Power Edition
Radeon HD 7750 Asus TOP 1GB Edition
Radeon HD 7750 Crossfire