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GeForce GT 640 DDR3 vs Radeon HD 7750


The GeForce GT 640 DDR3 comes with core clock speeds of 900 MHz on the GPU, and 1782 MHz on the 2048 MB of DDR3 memory. It features 384 SPUs as well as 32 TAUs and 16 Rasterization Operator Units.

Compare those specs to the Radeon HD 7750, which uses a 28 nm design. ATi has clocked the core speed at 800 MHz. The GDDR5 RAM runs at a frequency of 1125 MHz on this model. It features 512 SPUs along with 32 TAUs and 16 ROPs.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7750 55 Watts
GeForce GT 640 DDR3 65 Watts
Difference: 10 Watts (18%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7750 should in theory be quite a bit better than the GeForce GT 640 DDR3 in general. (explain)

Radeon HD 7750 72000 MB/sec
GeForce GT 640 DDR3 57024 MB/sec
Difference: 14976 (26%)

Texel Rate

The GeForce GT 640 DDR3 should be a bit (more or less 13%) more effective at texture filtering than the Radeon HD 7750. (explain)

GeForce GT 640 DDR3 28800 Mtexels/sec
Radeon HD 7750 25600 Mtexels/sec
Difference: 3200 (13%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce GT 640 DDR3 is the winner, but only just. (explain)

GeForce GT 640 DDR3 14400 Mpixels/sec
Radeon HD 7750 12800 Mpixels/sec
Difference: 1600 (13%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.

GeForce GT 640 DDR3

Other US-based stores

Radeon HD 7750

Other US-based stores


Model GeForce GT 640 DDR3 Radeon HD 7750
Manufacturer nVidia ATi
Year June 2012 February 2012
Code Name GK107 Cape Verde Pro
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 2048 MB 1024 MB
Core Speed 900 MHz 800 MHz
Shader Speed 900 MHz (N/A) MHz
Memory Speed 1782 MHz (3564 MHz effective) 1125 MHz (4500 MHz effective)
Unified Shaders 384 512
Texture Mapping Units 32 32
Render Output Units 16 16
Bus Type DDR3 GDDR5
Bus Width 128-bit 128-bit
DirectX Version DirectX 11.1 DirectX 11.1
OpenGL Version OpenGL 4.2 OpenGL 4.2
Power (Max TDP) 65 watts 55 watts
Shader Model 5.0 5.0
Bandwidth 57024 MB/sec 72000 MB/sec
Texel Rate 28800 Mtexels/sec 25600 Mtexels/sec
Pixel Rate 14400 Mpixels/sec 12800 Mpixels/sec

Memory Bandwidth: Bandwidth is the max amount of data (measured in MB per second) that can be transported across the external memory interface within a second. The number is calculated by multiplying the bus width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.


14 Responses to “GeForce GT 640 DDR3 vs Radeon HD 7750”
Anonymous says:
es una difícil desicion!
roe150 says:
im an nvidia fanboy but i got to admit gt 640 is shit comppared to hd 7750
onerky R says:
the reality is that ati in HD Gaming is better than GForce but too expensive.
Mmmn says:
Pues yo las veo muy similares, una tendra GDDR5 pero gasta mas energia, pero la otra procesa un poco mas rapido, yo las veo casi parejas, si acaso un 10% mas rapida la 7750, pero obvio un 10% mas cara... por lo menos aqui en mexico.
SomeOne says:
But why is the nvidia more expensive if the 7750 better :O


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magic says:
Im not sure if we're looking on the same page (roe150 said 640 is shit compared to 7750) but GeForce is faster in every respect except for consuming more power.. I found it in low profile format £20 cheaper on ebay than 7750.
Jezshit says:
its because GT640 is highly capable in physx game, because it has 384 cuda processor and 1782 memory clock even its ddr3
RaidnU says:
Bottom line, HD 7750 is better at processing games, period.
Anonymous says:
I just grabbed HD 7750 to replace my HD 4650 without even thinking to change psu, even i only have 330watt psu!!
Anonymous says:
... and it run great!!! Wooohoo. NVDIA sucks i will never tricked by your stupid phsyx gimmick!
oldarmyguy says:
I have both the HD 7750 and a GT 640 but my my GT 640 card has GDDR 5 not GDDR 3. The bandwidth on 640 GDDR 5 card is approximately 91238 MB/sec. There is no comparison, it runs Skyrim, Diablo 3 and Starcraft 2 at higher resolutions and framerates then the HD 7750.
oldarmyguy says:
This is a corrections to my last post about the GT 640 GDDR5 card I have:
Bandwidth - 80000 MB/s.
GPU Clock - 954 MHz
Memory Speed - 1250 MHz (2500)
GFlops - 910.4
Pixel Fill - 15.3 GPixel/s
Texture Fill - 30.5 GTexel/s
I apologize about my previous post, I misread the GPU-Z printout. (Senior moment)
milisav says:
Memory Speed 1782MHz.Ha ha, higher from every card that's ddr3 already

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