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[OFFICIAL] FX-8320/FX-8350 Vishera Owners Club - Page 340

post #3391 of 67258
Quote:
Originally Posted by kzone75 View Post

4.739GHz @ 1.424v Was on my 12th hour Prime95 and then power went out in the house. Annoying..mad.gif

Would you mind posting the rest of your settings? smile.gif
post #3392 of 67258
Quote:
Originally Posted by KyadCK View Post

What NB stability issues? Seriously, it does get hot, but it hasn't effected anything, and I have not replaced the paste. I'm assuming Temp 3 is NB:

Ignore the score, Cine was for quick temps, I have a lot running in the background.
Not quite, due to how the AMD memory controller works.
In reality, you don't have "dual channel" per say, you have 2 memory channels. They don't operate in 128-bit, they operate as 2 separate 64-bit. Each channel can be used by a different core at the same time.
This is what is known as UnGanged mode. Ganged forces the 2 controllers to work together. You can change this in the BIOS.
More then likely, the CPU/NB can't keep up after a point. As much as NB OCs don't seem to help normally, it would be interesting to see how 2400 fares with the NB at 2.6.

That's why I'm curious about that. If it's a limitation of the CPU cache rather than the IMC or on board NB, then should 1 stick of Ram have much better scaling over 1866Mhz compared to 2 in Dual Channel?

If it makes no difference, then it's a bottleneck at the NB through the 64-bit lanes?
Edited by ComputerRestore - 11/16/12 at 5:40am
post #3393 of 67258
Thread Starter 
Quote:
Originally Posted by ComputerRestore View Post

Quote:
Originally Posted by KyadCK View Post

What NB stability issues? Seriously, it does get hot, but it hasn't effected anything, and I have not replaced the paste. I'm assuming Temp 3 is NB:
Ignore the score, Cine was for quick temps, I have a lot running in the background.
Not quite, due to how the AMD memory controller works.
In reality, you don't have "dual channel" per say, you have 2 memory channels. They don't operate in 128-bit, they operate as 2 separate 64-bit. Each channel can be used by a different core at the same time.
This is what is known as UnGanged mode. Ganged forces the 2 controllers to work together. You can change this in the BIOS.
More then likely, the CPU/NB can't keep up after a point. As much as NB OCs don't seem to help normally, it would be interesting to see how 2400 fares with the NB at 2.6.

That's why I'm curious about that. If it's a limitation of the CPU cache rather than the IMC or on board NB, then should 1 stick of Ram have much better scaling over 1866Mhz compared to 2 in Dual Channel?

If it makes no difference, then it's a bottleneck at the NB through the 64-bit lanes?

Good question. Personaly, I don't see how limiting the bus width which should be 128 all the way through would allow for greater speed on half the bus. Either way, I don't have fast enough RAM laying around to test scaling that high.
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post #3394 of 67258
It seems like no matter what voltage I run as soon as my NB gets over 75c I'm more likely to get errors. Regardless I will take action in lowering my NB temps by repasting and adding a spot fan. If it works, cool, if not, we'll put my theory to rest. Doesn't hurt to try.
post #3395 of 67258
Quote:
Originally Posted by KyadCK View Post

Good question. Personaly, I don't see how limiting the bus width which should be 128 all the way through would allow for greater speed on half the bus. Either way, I don't have fast enough RAM laying around to test scaling that high.

I just see it like this, which may be wrong, I'm not sure. (CPU Bandwidth Bottleneck example)

Ram(Dual Channel 1866Mhz) --->--->--->--->CPU-->-->-->-->

Ram(1 Stick Single Channel 1600Mhz) ->->->->CPU->->->->->

Ram(1 Stick Single Channel 2166Mhz) -->-->-->-->CPU-->-->-->-->

Edited: See Bold
Edited by ComputerRestore - 11/16/12 at 7:57am
post #3396 of 67258
Thread Starter 
Quote:
Originally Posted by ComputerRestore View Post

Quote:
Originally Posted by KyadCK View Post

Good question. Personaly, I don't see how limiting the bus width which should be 128 all the way through would allow for greater speed on half the bus. Either way, I don't have fast enough RAM laying around to test scaling that high.

I just see it like this, which may be wrong, I'm not sure. (CPU Bottleneck example)

Ram(Dual Channel 1866Mhz) --->--->--->--->CPU-->-->-->-->

Ram(1 Stick Single Channel 1600Mhz) ->->->->CPU->->->->->

Ram(1 Stick Single Channel 2166Mhz) -->-->-->-->CPU-->-->-->-->

Dual Fast:
--->--->--->--->CPU-->-->-->-->
--->--->--->--->CPU-->-->-->-->

Dual Slow:
->->->->CPU->->->->->
->->->->CPU->->->->->

Single fast:
--->--->--->--->CPU-->-->-->-->

Single Slow:
->->->->CPU->->->->->

Ganged Dual:
--->--->--->--->CPU-->-->-->-->
--->--->--->--->"""""-->-->-->-->

Don't confuse Bus width with speed. They are 2 different things.
Edited by KyadCK - 11/16/12 at 6:48am
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post #3397 of 67258
Quote:
Originally Posted by stickg1 View Post

Someone was asking about Folding@Home performance the other day for the Vishera line. My FX-8320 at 4.6GHz gets about 25K-35K PPD. This was after some tweaking and adding advanced flags.

It was me and thanks.

My 1055T gets about 11k PPD on 4 cores. Might be about 21k PPD on all 6. ^That would be a decent upgrade for me.
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post #3398 of 67258
Quote:
Originally Posted by KyadCK View Post

Dual Fast:
--->--->--->--->CPU-->-->-->-->
--->--->--->--->CPU-->-->-->-->
Dual Slow:
->->->->CPU->->->->->
->->->->CPU->->->->->
Single fast:
--->--->--->--->CPU-->-->-->-->
Single Slow:
->->->->CPU->->->->->
Ganged Dual:
--->--->--->--->CPU-->-->-->-->
--->--->--->--->"""""-->-->-->-->
Don't confuse Bus width with speed. They are 2 different things.

Yeah, I guess my diagram kinda sucked. It was meant to represent the bandwidth of what the Ram is capable of VS what the CPU could use.

I really want to pick up an 8320 to play with, but I also want a Catleap....
Edited by ComputerRestore - 11/16/12 at 9:54am
post #3399 of 67258
OK, so I've decided that this is my next motherboard:

http://www.hitechlegion.com/reviews/motherboards/31671-asus-m5a99fxpro-r2?showall=&start=11

I had this board briefly, and was turned off initially by it's lack of core unlocking abilities (which I shouldn't really care about, since I'm putting an FX-8350 into it, not my old PII X2 550BE anyhow), and by the fact that my bios-flashed (1000MHz core/1375MHz memory) 7950 wouldn't boot with it (it worked fine with the factory 900MHz core/1250MHz memory bios). However, on further reflection after much research, I care more about the slot layout, VRM stability, northbridge cooling and overclocking stability than whether I have to use software or bios overclocking with my graphics card. It was just hard to go back to software after having the bios flashed overclock on my 7950, but screw it, I'll just do it in software.

This board has the Asus Digi+ digital VRMs and power regulation, which I really like. The power phases are 6+2+2, which seems more than adequate. Except for the 8+2+2 power phases and the ability to run more than 2 graphics cards, it's like an Asus Sabretooth 2.0 for $35 less. I can buy it locally for $155 and avoid shipping charges and any hassles if it's DOA, as the store will simply hand me another new one the same day if I need it. Since I don't like the Sabretooth's PCI-E slot layout anyhow, and I never plan to use more than 2 graphics cards in this build, I'm feeling pretty good about this board.

I'm thinking of picking it up today after work. Now, the memory! I'm thinking of getting 2x4GB of DDR3-1600 CL9 ram (whatever Corsair/Patriot/Kingston version is cheapest). Is there a benefit to getting DDR3-1866 or even DDR3-2166 ram? I'm going to initially use my Antec Kuhler 620, and move eventually to a better water cooler, so I'm not worried about ram clearance issues.

Any thoughts/suggestions? Thanks in advance!
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post #3400 of 67258
Here is what my vcore looks like during a test with cpu LLC on high.



Edited by MistrEd - 11/16/12 at 10:44am
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