7800GT Vs 7800GTX for Render OPS

[K404]

Hey! I see from spec sheets that the 780GTX has 24 pipes, but only 16ROPS, and the 7800GT has 20 pipes and also 16ROPS.

Because the pixel output (I think) is dictated by the ROP count, do the extra 4 pipes not matter? I know they can still process data, but if a GT and a GTX were compared at the same clock speed, how big a difference would there be in real (ie..game) performance?

Cheers,

Kenny

 

[Mindless-Moron]

I swear thati read that the GT has one or two less ROP's than the GTX.

 

[maverik-sg1]

I thought Gt had 20 pipes and 12 ROP's???

Mav

 

[K404]

Please can you double-check for me? A review I read stated 16 ROPs... I`m away out (again!) so cant have a read through until later. I`ll be laying off the alcohol tonight, so i`ll still make sense when I get in

Kenny

 

[maverik-sg1]

Typical GT specs:



- Core clock 430MHz

- 20 Pixel Pipelines

- 1000MHz+ GDDR3 Ultra Fast Memory

- 256-Bit Memory interface

- 7 Vertex Shaders

- Memory Bandwidth - 38.4GB/sec

- Fill Rate - 10.32 billion pixels/sec

- Next-generation superscalar GPU architecture

- NVIDIA® CineFX™ 4.0 engine

- 64-bit floating point texture filtering and blending

- NVIDIA® SLI™ Ready (NVIDIA SLI-certified versions of GeForce 7800 GTX only)

- NVIDIA® Intellisample™ 4.0 technology

- NVIDIA® PureVideo™ technology

- NVIDIA® ForceWare™ Unified Driver Architecture

- NVIDIA® nView® multi-display technology

- Microsoft® DirectX® 9.0 Shader Model 3.0 support

- OpenGL® 2.0 support



Typical GTX specs:



Core clock 430MHz

- 24 Pixel Pipelines

- 1200MHz GDDR3 Ultra Fast Memory

- 256-Bit Memory interface

- 8 Vertex Shaders

- Memory Bandwidth - 38.4GB/sec

- Fill Rate - 10.32 billion pixels/sec

- Next-generation superscalar GPU architecture

- NVIDIA® CineFX™ 4.0 engine

- 64-bit floating point texture filtering and blending

- NVIDIA® SLI™ Ready (NVIDIA SLI-certified versions of GeForce 7800 GTX only)

- NVIDIA® Intellisample™ 4.0 technology

- NVIDIA® PureVideo™ technology

- NVIDIA® ForceWare™ Unified Driver Architecture

- NVIDIA® nView® multi-display technology

- Microsoft® DirectX® 9.0 Shader Model 3.0 support

- OpenGL® 2.0 support

Mav

 

[maverik-sg1]

Here is a better cross reference:

7800GT:

7 Vertex Pipes

20 Pixel Pipes

16 ROP Pipes

400mhz Core

500Mhz Mem

7800GTX:

8 Vertex Pipes

24 Pixel Pipes

16 ROP Pipes

430mhz Core

600Mhz Mem

Cheers

Mav

 

[maverik-sg1]

And to put this into perspective:

Very impressive and if benching is not your thing there is a compelling argument to go for the 7800GT's in SLI and save some money - not to say you wont have stonking 3dmark scores - but there will be a noticeable gap Vs GTX's.

 

[Grov]

It has 1 Vertex shader less as well. Looking at the price of a GTX, it's worth the extra IMO.

 

[K404]

Thanks Mav... I knew there would be a difference.. I`ll be honest, I dont really know how GPUs work, but I`m guessing the extra shader carries a fair chunk of the extra performance in the GTX..

Seeing as all GT/GTX cards are still the reference design, I know where to get a GT for £250 delivered, that`ll do me, definately, assuming I go for it

Kenny

 

[matisamd]

lol yea my 7800gtx was only £323 delivered