Originally Posted by R3ap3R
Are you measuring per SPE? Cause the real answer is 2 Tflops
Dead wrong there. Sony just likes to make up numbers and throw them out there. No surprise though, Sony has had a long history of dishonesty.
The real processing power can be figured out mathematically.
Each SPE can do 4 multiply-adds per clock cycle, so that a total of 8 operations per clock. Multiply that by a clock of 3.2GHz and you get 25.6Gflops. Since there are 7 functional SPE's and one PPE, multiply that number by 8 and you get 204.8Gflops, or rounded up to 205Gflops as offically stated.
The GPU puts out nowhere near 1.8Tflops as Sony claims. The RSX is based on the G70 architecture, which consists of 24 pixel shaders. According to official specs, each shader can do 8 multiply-add operations, so that makes a total of 16 operations per shader, per clock. Multiply that by 24 and you get 384 operations per clock. Take that, in turn, and multiply it by the 550MHz clockspeed and you get 211.2 Gigaflops. Nowhere near 1.8 Teraflops. Wonder where Sony pulled those numbers from?
Also, here is an old post I made regarding the same thing:
Originally Posted by HrnyGoat
I found the statement that the RSX in the PS3 can do 1.8 Teraflops a little absurd. So I decided to do some research on it.
Here we have Sony's initial claims:
GPU: RSX @550MHz
1.8 TFLOPS floating point performance
Full HD (up to 1080p) x 2 channels
Multi-way programmable parallel floating point shader pipelines
Now take a look at this slide:
Note the number of FLOPs (floating point operations) per clock. 384 to be exact. Now its time to do a little multiplication. Multiply the number of FLOPs by the RSX's clockspeed, which is 550MHz.
384 x 550,000,000 = 211,200,000,000
211.2 Billion is the result. That ends up being 211.2 Gigaflops. Thats right, Gigaflops, not Teraflops.
211.2 GFLOPS = 211,200,000,000
1.8 TFLOPS = 1,800,000,000,000
That means that Sony has exagerated the power of the RSX by a factor of 8. In fact it is 7 Gigaflops slower than what Sony claims for the CELL (218 [205 now] Gigaflops). Makes you wonder how exaggerated the CELLs power is. Considering that Sony is being truthful about the CELL, that means that the total system power is only 429 [416.2] Gigaflops, which is nowhere close the 2 Teraflops that Sony "claims" the PS3 can do.
Does Sony think they can get away with such deception? If you know any die-hard Sony fanboys, make sure they see this. I think they need to know the truth
Originally Posted by stargate125645
Does the PS3 allow the GPU to help with computations, or is it only the Cell processor?
As far as I know, the G70 architecture is incapable of GPGPU tasks.