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ATI vs Nvidia GPU's

post #1 of 8
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I am working on a new build and I am seeing the GT200 series and the HD 4000 series. I just want to know why ATI uses 800 stream processors and Nvidia only uses 240. Yet, these cards are about equal. I think, maybe not because of the 1GB of memory. What exactly would the Stream Processors provide. I am thinking of doing 1 Nvidia GPU or CFX 2 ATI GPU's. Anyone have benchmarks with R4870
post #2 of 8
Complete difference in architecture used is the reason why. Also, nvidias shaders have a much higher clock than ATis shaders.
post #3 of 8
They use different archs for their cards, so the only "real" comparison that can be made between the two is in-game performance and synthetic benchmarks. Early reviews of the cards show that the HD4xxx are a better value, but it's still to early to say for sure. ATI cards tend to get better as drivers mature (look at the x1xxx and HDxxxx cards), but the nvidia cards are pure muscle from the get go plus the fact that nvidia is cutting prices like crazy at the moment.
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post #4 of 8
Quote:
Originally Posted by sledgehammer1990 View Post
I just want to know why ATI uses 800 stream processors and Nvidia only uses 240. Yet, these cards are about equal. I think, maybe not because of the 1GB of memory. What exactly would the Stream Processors provide.
Personally, I dont' think anyone should really even worry about the hardware details. Beyond marketing, these numbers mean almost nothing. They can't be compared because what ATI defines as a "stream processor" is different from what Nvidia uses because the architectures are very different. It would be similar to expecting a 2.0GHz Pentium4 to be as fast as a 2.0GHz C2D, except instead of GHz it's cores.

Quote:
I am thinking of doing 1 Nvidia GPU or CFX 2 ATI GPU's. Anyone have benchmarks with R4870
There aren't really any benchmarks yet. This launch as a whole, ATI has been incredibly secretive about everything. Although the HD4850 was released, AMD was very strict about the specifics of the NDA that were lifted. Sites are still forbidden from talking about the architecture, for example, or giving any information on the 4870. But, because HD4850 and HD4870 use the exact same core with different clocks and memory, you can still guess as to how a HD4870 will perform. From looking at the numbers on techreport, you can see that the HD4850 is damn close to the GTX260 and even beats it in a few tests (Except at the 2560x1600 because the GDDR3 will be starving the card of bandwidth). Now if we assume that the HD4870 is roughly 20% faster (and won't have bandwidth issues at that higher resolution), that quite comfortably puts it right between the two GTX models, ahead of the GTX280 in some cases. The performance you will get for the price of the HD4870 is downright absurd. For $350 less (going by the $300 price tag for the 4870), you should be able to get performance on par with a GTX280. As if that isn't enough, they're still releasing R700
post #5 of 8
The ATi Gpus work with so many more processes per clock 4 simple and one complex or something so it is multi-threaded if you get me. Now the Nvidiumdidiums run with only one. However there is a heck of a lot more power dedicated to each of course 240 as one you see... and 800 into 5 (800/5 = 160) see? Also the programs that are designed with Nvidia in mind are easier to code for (not multi-threaded) so this is why there are more of them about. ATI cards really are pretty damn powerful indeed but it's just not often anyone codes a game to use their power so it goes to waste really
Edited by Unstableiser - 6/21/08 at 9:25am
post #6 of 8
Man, looks like a perfect fanboy face-off thread.
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post #7 of 8
ATI uses a ringbus setup with their processors while NVIDIA use more of a staight-through with passback architecture.
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post #8 of 8
I don't know I guess it's nice there are two types cos it's two areas of research. I think Nvidias way is better for business lol. But is it better for the future? If anyone can ever be arsed to start coding in a much more complex way which seems unlikely Then this new thingy with that game company, maybe they will?

Off topic wildly but when does that game come out set in America with some dude and it's like a horror and it's an rpg I think. Sorry I just had to type it before I forgot.
Edited by Unstableiser - 6/21/08 at 9:43am
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