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Technology Stocks : Advanced Micro Devices - Moderated (AMD) -- Ignore unavailable to you. Want to Upgrade?

To: pgerassi who wrote (255281)	8/6/2008 1:16:09 AM
From: eracer	Read Replies (1) \| Respond to of 275872

Re: Did you notice that the 1600x1200 is not using AA but just 4 samples (4xAF)? The terminology used in the paper isn't clear as "4 samples" and "multisampling" can also refer to antialiasing. I assumed AA as 4xAA is more commonly used in benchmarking than 4xAF. Using either would have a negative impact on framerate. Comparing it to a test where 1600x1200 using 16AF and 4xAA is like turning down the settings to bare minimum. Thus its like turning to low quality 60FPs 1600x1200 in a game like FEAR where most modern entry level GPU cards are CPU limited. That's why I gave an "apples-to-oranges" warning in my earlier posts. At high settings FEAR is not bottlenecked by the CPU even at 1024x768 and no AA/AF. In the following review the 4870 gets 223 FPS at 1024x768 and no AA/AF. The framerate would be lower at 1600x1200 and 4xAA or 4xAF. techpowerup.com Besides the current top IGP is the 790GX which runs like a Radeon 3470 with the 128MB sideport memory and dual channel PC2-8500. The 40:4:4 790GX at 500MHz/533MHz SP enabled with Phenom 9550 DDR2-1066MHz unganged gets 30FPS at 1600x1200 in FEAR high quality. Pushing it to 1000MHz/533MHz SP enabled boosts that by 10% to 33FPS. Disabling the SP at 500/533MHz reduces the FPS to 26. Thus a 20% memory BW reduction yields a 13.3% FPS reduction. That shows it to be mostly memory BW limited. Next time provide a link with benchmarks. Imagine a 2008 IGP getting a real 50% of a 13 core Larrabee estimate for 2010. Given the memory BW considerations, look for a 2010 8 core Larrabee to be the equal of a 2008 790GX IGP. Good luck with that. Of course given that IGPs have doubled or tripled in performance every year, the 2010 40nm SOI IGP (R870 based) would be about 4 to 9 times the performance of the current 790GX or between 26 and 60 GHz Larrabee cores... Wow, the fastest 45-nm Larrabee may be outclassed by Fusion integrated graphics! Good luck with that, too. You'll need it. PS: Got a link showing 40-nm Fusion graphics will be SOI, preferably one from AMD?