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Old 2014-01-19, 21:16   #1
kracker
 
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Default 8 phase 12 phase, blah blah

hey all,

I was just wondering, is there a lot of difference between 8 phase and 12 phase etc motherboards?(was comparing two) I don't plan to overclock too much, but I will some.

EDIT: Yes, this will be a haswell replacing a old AMD quad... was going to do it last Dec. but was too busy

Last fiddled with by kracker on 2014-01-19 at 21:31
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Old 2014-01-19, 21:56   #2
kladner
 
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This is entirely speculative, and off the cuff, but it seems that TDP has been going down, at least in the Intel camp. I suppose that more phases are supposed to be more responsive and regulate better. However, the first point might argue that such heavy supply infrastructure is less necessary than with hungrier CPUs.

That said, without really intending to, I ended up running an Asus Crosshair board, which has twice as many PSU inputs as the usual boards I had before, and claims some high number of phases.....here's the blurb from the website spec sheet-
Quote:
Extreme Engine Digi+ II :
- 8 + 2 phase power design
- 2 -phase Memory power design
In truth, I run this board at stock, even though it is supposed to have plenty of OC cred. I actually found it to be a fairly touchy board to deal with. Some of that may have related to the huge number of setting made available in the BIOS, though I have run many of those at Auto.

Pardon the rambling response. I didn't really answer the question. I guess my intent was to say that the multi-phase capability has not seemed to make much difference for me, but I'm not doing OC, except on the GPUs.

My few experiments with OCing the FX-8350 produced worrisome temps, even with a truly monstrous air cooler and push-pull fans.

Pushing the CPU has not been high on my list since I started feeding the real power to, and fighting the heat coming from two high-end GPUs. I admit to OCing those when doing TF. I throttle back a lot to run CudaLucas, on both the GPU and the VRAM. In any case, I'm already drawing on a kilowatt PSU about as hard as I'm comfortable with.
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Old 2014-01-19, 22:09   #3
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Default 20 seconds on google - and a day to read... Enjoy

http://www.tomshardware.com/answers/...herboards.html
http://www.hardwaresecrets.com/artic...-Circuit/616/4
http://www.overclock.net/a/about-vrm...tdp-processors
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Old 2014-01-19, 22:17   #4
kladner
 
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Interesting line from the first link-
Quote:
PS: Haswell moved part of the VRM onto the CPU itself. This is part of the reason Haswell runs hotter than Ivy Bridge.
I would still put money on the thermal interface to the Integrated Heat Spreader being a bigger factor.

EDIT: The last piece is particularly informative, too. Thanks!

Last fiddled with by kladner on 2014-01-19 at 22:29
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Old 2014-01-19, 22:21   #5
kracker
 
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I knew and read most of that before I posted, I know what they are. I'm just wondering if over 8 phase etc is really worth it and when it would be worth it.
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Old 2014-01-20, 02:33   #6
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As many of the posts in those other places indicate, it is on case by case basis. "A 12 phase Brand A board may not necessarily be better (and could be much worse) than an 8 phase Brand B (or product line C) board".
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