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Weird i7 PPD...

post #1 of 4
Thread Starter 
if I fold using all 8 threads on my i7, I get around 10-14k ppd...(0xa3)

If I fold using 6 threads on my i7, (leaving 2 for my GPU), my CPU gets around 18-23k ppd. (0xa3)


Why would my i7 get more ppd using 6 (and a GPU) over just using a CPU to fold?
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post #2 of 4
I assume your GTX670 is folding BETA core units. If that is the case, the BETAs need a whole CPU core for Nvidia cards so when you are folding CPU 8 your CPU and GPU are fighting for cycles. Keep it at CPU 6, you can try CPU 7 but some units don't like the odd number of cores folding.
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post #3 of 4
This is on your main rig with the 670, right? Nvidia GPUs need one dedicated CPU thread per card to operate efficiently (when folding Core 17 work units).

If you set the SMP client to use all 8 threads, then the SMP and GPU folding processes will be fighting over CPU resources. The SMP folding process needs all of the threads to be synchronized, but the other CPU threads end up having to wait for the one handicapped thread to catch up. The end result is that 8 threads ends up being slower than 6.
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Tygon silver tubing 0.5" ID 0.75" OD 2x Watercool HEATKILLER® GPU-X³ GTX TITAN/780/7... Alphacool HF D5 acetal pump top Aquacomputer D5 pump (USB/Aquabus) 
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post #4 of 4
Thread Starter 
No no. I'm saying that my CPU gets considerably less ppd by itself....8 threads, no GPU slot at all.

Seriously, I've only witnessed higher CPU ppd when I have my GPU slot enabled as well

I'll break it down like this...

Situation A.
CPU folding 6 threads 20,000ish ppd
GPU folding (no tags) 80,000ish ppd

Situation B.
CPU folding 8 threads (10-12,000) ppd
No GPU slot
Edited by lacrossewacker - 9/2/13 at 1:29pm
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Main Rig
(13 items)
 
Secondary Rig
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CPUMotherboardGraphicsGraphics
i7 3770k MSI Z77A-GD65 Gigabyte 780 OC Gigabyte 780 OC 
RAMHard DriveHard DriveOptical Drive
Ripjaw  Samsung F3  Samsung 830  Asus CD-Rom 
CoolingMonitorMonitorPower
Cooler master hyper 212+  Asus  27in 1440p Auria EQ276W 760 Watt Silencer 
Case
Haf 912 
CPUMotherboardGraphicsGraphics
i7 3770k ASRock Z77 Pro4-M 290 XFX DD R9 280X Gigabyte 
GraphicsGraphicsRAMHard Drive
R9 280X MSI Gaming R9 280X Power Cooler Crucial Ballistix  Samsung 830 series 
Hard DriveOptical DriveOSMonitor
WD Black Asus 24x Windows 7 Asus 24in  
MonitorPowerCase
27in 1440p Auria CM 750 600T 
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