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Why is GPU better for folding than a processor?

post #1 of 4
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In another thread I was wondering if my pure 4770k setup with intel hd would be fine, and I was informed to go with at least a mid grade graphics card for much more PPD. I thought folding was primarily CPU oriented? What does the GPU have that the CPU is lacking/
post #2 of 4
https://en.bitcoin.it/wiki/Why_a_GPU_mines_faster_than_a_CPU
Quote:
Short Answer

A CPU core can execute 4 32-bit instructions per clock (using a 128-bit SSE instruction) or 8 via AVX (256-Bit), whereas a GPU like the Radeon HD 5970 can execute 3200 32-bit instructions per clock (using its 3200 ALUs or shaders). This is a difference of 800 (or 400 in case of AVX) times more instructions per clock. As of 2011, the fastest CPUs have up to 6, 8, or 12 cores and a somewhat higher frequency clock (2000-3000 MHz vs. 725 MHz for the Radeon HD 5970), but one HD5970 is still more than five times faster than four 12-core CPUs at 2.3GHz (which would also set you back about $4700 rather than $350 for the HD5970).
post #3 of 4
Super simplified version. Think of it a bit like this: an 7970 has 1792 stream cores clocked at 1 GHz. Now thees stream cores are not quite the same thing as CPU cores as they are far more limited in what they can do but they are great for basic calculations and as there is a lot of them they can get more stuff done.

So what does a GPU have that a CPU does not? Answer: Massive parallelism.
Edited by Bit_reaper - 8/10/13 at 5:28pm
    
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CPUMotherboardGraphicsRAM
i7 920 OC 4.0 GHz 1.35v HT on Asus P6T 1366 SLI Gigabyte GTX 970 OCZ 12GB DDR3 GOLD/Platinum mix 
Hard DriveHard DriveHard DriveHard Drive
Samsung Spinpoint F1 1TB Western digital 300GB Western digital Caviar Blue 1TB Samsung 840 EVO 250Gb 
Optical DriveCoolingOSMonitor
generic LG DVD WC'd , Supreme LT, NexXxoS Xtreme III 360, Phob... Windows 7 x64 Samsung 27" LED S27A550B 
MonitorMonitorKeyboardPower
ACER 23" x233H Dell U3415W Logitech G11 Chieftec 850W 
CaseMouseMouse PadAudio
Phanteks enthoo luxe Razer deathAdder respawn steelseries Qck Yamaha HTR-6130 AV Receiver 
AudioAudio
Yamaha NS-50B floor tower speakers miditech Audiolink II stereo sound card 
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post #4 of 4
Quote:
Originally Posted by abombthecoder View Post

In another thread I was wondering if my pure 4770k setup with intel hd would be fine, and I was informed to go with at least a mid grade graphics card for much more PPD. I thought folding was primarily CPU oriented? What does the GPU have that the CPU is lacking/


The GPU client was massively improved earlier this year, so now GPUs get more work done.

 

CPU folding hasn't changed much, in terms of PPD.  Plus the Fahcore for CPUs still haven't even implemented AVX support, let alone AVX2 found on your Haswell.

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