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GeForce GT 640 DDR3 vs Radeon HD 7750

Intro

The GeForce GT 640 DDR3 has a core clock frequency of 900 MHz and a DDR3 memory speed of 1782 MHz. It also features a 128-bit memory bus, and makes use of a 28 nm design. It features 384 SPUs, 32 TAUs, and 16 ROPs.

Compare those specs to the Radeon HD 7750, which uses a 28 nm design. AMD has clocked the core speed at 800 MHz. The GDDR5 memory is set to run at a frequency of 1125 MHz on this model. It features 512 SPUs as well as 32 TAUs and 16 ROPs.

Display Graphs

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(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

The Radeon HD 7750 should theoretically perform quite a bit faster 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 is a little bit (approximately 13%) more effective at anisotropic 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 lots of anti-aliasing is important to you, then the GeForce GT 640 DDR3 is superior to the Radeon HD 7750, 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

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GeForce GT 640 DDR3

Amazon.com

Radeon HD 7750

Amazon.com

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model GeForce GT 640 DDR3 Radeon HD 7750
Manufacturer nVidia AMD
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 3564 MHz 4500 MHz
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 11.0 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: Memory bandwidth is the max amount of data (in units of megabytes per second) that can be transferred across the external memory interface in one second. It is calculated by multiplying the interface width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Comments

15 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

Confused!

[...] Ruby Hole Ngày tham gia: Mar 2012 Bài viết: 335 Được cảm ơn: 19 Uy tín: GeForce GT 640 DDR3 vs Radeon HD 7750 – Performance Comparison Benchmarks @ Hardware Compare GT640 ddr3 và HD7750 ddr5 hoho Trả lời kèm Trích [...]

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

chhuanga says:

i have used gt 640 before and i bought a 7750 dont know why its better here but for me 7750 is like much much more faster in witcher 2 i can only play in low with gt640 but with hd 7750 i can play with high

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