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[OFFICIAL] FX-8320/FX-8350 Vishera Owners Club - Page 315

post #3141 of 67343
Installed the FX 8320 about 5 mins ago.. http://valid.canardpc.com/2581366

Geekbench 8320
Geekbench 8120

I didn't reset the BIOS at all during the switch..

Cinebench single 1.19 (runs on all cores..?)
multi core 7.68
OpenGL 78.08
Edited by kzone75 - 11/13/12 at 8:42am
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post #3142 of 67343
Quote:
Originally Posted by ComputerRestore View Post

Thanks @ Flank3r, very nice info and tests. Thanks for also confirming my estimates I made a while back.
Also by reading a lot of other overclocks on these forums, I'm starting to wonder....
a) Low Voltage overclocks on these chips seem almost entirely Chipset Based (Cooler running chipsets require much less CPU voltage)
b) Chipset temperatures over a certain threshhold cause a need for really high VCore during overclocks.
c) How effective would a Chipset Waterblock be on PileDriver? (6Ghz Overclclock stable?)
This is all a guess, but it might be worth looking into. Putting a fan over the chipset may not be enough either, if the heat transfer to the Heatsink isn't great.
I'd recommend for anyone having high VCore issues to repaste the Chipset Heatsinks.
It's also worth mentioning that they are not always installed properly as well. For example
- Crosshair IV Formula and Exteme both had an issue where they used the wrong size stand-off under the heat sink. The Heat Sink, barely touched the North Bridge Chip - and would overheat during normal operation, let alone Overclocking.
Quote:

Hey CR,
The first thing I do on a new build is to remove the heatsink assembly and replace the TIM. for whatever reason even the high end boards seem to use a lower grade TIM or thermal pad and replacing it always drops temps by 7-15c. you can WB the board (VRM,NB) but a spot fan will suffice. I did this on both my CVF and UD7 and OC temps ran no higher than low 40c's under heavy OC loads.

6GHz will only be reached with exotic cooling. (DICE, very powerful TEC,. LN2, and I read that a guy was able to do it with a phase change unit) I have my 8350 under three high quality rads (1 x 45mm x 360mm, 1 x 45mm x 240mm, 1 x 45mm x 120mm) and dual D5 pumps (dedicated to CPU cooling)
For most Vishera chips, under quality water cooling, around 5.0-5.2 is what they have to offer. I just got 5.3GHz stable on mine, but I believe I got an exceptional chip.
Quote:
It's also worth mentioning that they are not always installed properly as well. For example
- Crosshair IV Formula and Exteme both had an issue where they used the wrong size stand-off under the heat sink. The Heat Sink, barely touched the North Bridge Chip - and would overheat during normal operation, let alone Overclocking.
yep I had one of those and had to mod the standoffs on mine. I knew about the issue before mine showed up and was looking for it. The heatsink wasn't even making contact with the NB chip.


Quote:
@ Flank3r - Would you put the CHV-Z above the regular CHV and UD7 for overclocking and ease of use or are they about the same?

@ UT, I will throw my 2 cents in here as I own both the CVF and the UD7. (rev 1.1) with both the FX-8150 and FX-8350 I got slightly higher OC's with the UD7. I went with the UD7 for its PCIE slot availability and arrangement because I'm a quad GPU guy. ( i did run quad CF on the CVF with a passive PCIE riser, but kind of a pain in the ***)The CVF and UD7 are both 8+2 power phase setups (the CVF 'Z' is 8+2+2) I will be trying the 'Z' out here soon. That aside they are very close in performance so it comes down to features you prefer, color scheme, etc.

Edited by Red1776 - 11/13/12 at 8:41am
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post #3143 of 67343
Thanks for the info Red1776. I will probably just bite the bullet and order the UD7. Worst case is I just sell it if i don't like it.
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post #3144 of 67343
Quote:
Hey CR,
The first thing I do on a new build is to remove the heatsink assembly and replace the TIM. for whatever reason even the high end boards seem to use a lower grade TIM or thermal pad and replacing it always drops temps by 7-15c. you can WB the board (VRM,NB) but a spot fan will suffice. I did this on both my CVF and UD7 and OC temps ran no higher than low 40c's under heavy OC loads.

6GHz will only be reached with exotic cooling. (DICE, very powerful TEC,. LN2, and I read that a guy was able to do it with a phase change unit) I have my 8350 under three high quality rads (1 x 45mm x 360mm, 1 x 45mm x 240mm, 1 x 45mm x 120mm) and dual D5 pumps (dedicated to CPU cooling)
For most Vishera chips, under quality water cooling, around 5.0-5.2 is what they have to offer. I just got 5.3GHz stable on mine, but I believe I got an exceptional chip.

Thanks for the info Red1776.

I repasted my Gigabyte Board, but temps were still not that great even with a fan. (Dropped from 70 Celsius to 59ish) It at least it let me run a 4.8Ghz daily on my Dozer. (8150)

So would you say then that keeping the chipset and VRM's around 40 Celsius can reduce your required VCore on Piledriver?

My thoughts on throwing a WaterBlock on the Chipset and VRM's was to crank up the voltage on those to see if it can push the CPU more.
But if the fan and repaste alone can keep temps around 40 Celsius, maybe it's worth pushing it a little on air, to see how much the VCore can be lowered. (Not saying to increase the Overclock on the NB/HTT, just a bit more of a voltage bump)


Quote:
A Couple Examples pulled from the OP's OC Listing

FX-8350 4.6GHZ @ 1.5v Regular 23 200 GA-970A-UD3 / 1.1 / F7 - (No VRM Heat Sink, Poor GB Paste)

FX-8320 4.6GHZ @ 1.47v 23 200 MSI 990FXA-GD65/Rev2/V19.9 - (Fancy MSI Heat Sinks. But they generally don't seat well)

VS

FX-8350 4.6GHZ 1.356vSabertooth 990FX/Rev1/1604Bios

FX-8350 4.6GHZ 1.418vSabertooth 990FX / R2.0 / 1006
This is not an ASUS vs Others comparison. But the Sabertooth have been shown to be consistenly built well.

Not sure if these were Brute Force Overclocks. But it would be interesting to know if it is a chipset overheat issue causing the need for this type of VCore. Or if some of these chips are actually just poor overclockers.

Edited by ComputerRestore - 11/13/12 at 10:52am
post #3145 of 67343
Don't forget my 8320 on an R2 saber with watercooling, replaced TIM on board heatsink and low temps. Still needs 1.55v for 4.8ghz. Some are just better clockers than others. It's the silicon lottery.

I'm talking proper stable as well, how many in the OP really are?
Edited by wolvers - 11/13/12 at 12:03pm
post #3146 of 67343
Quote:
Originally Posted by wolvers View Post

Don't forget my 8320 on an R2 saber with watercooling, replaced TIM on board heatsink and low temps. Still needs 1.55v for 4.8ghz. Some are just better clockers than others. It's the silicon lottery.
I'm talking proper stable as well, how many in the OP really are?
That's a great point , so subjective and probably as much a gauge of owner honesty as anything.wink.gif
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post #3147 of 67343
Absolutely deplorable temps @ 4.5 GHz with stock vCore and LLC set to Medium.

GA-990FXA-UD3 Rev. 1.1
Corsair H80

Bad silicon?
post #3148 of 67343
Quote:
Originally Posted by wolvers View Post

Don't forget my 8320 on an R2 saber with watercooling, replaced TIM on board heatsink and low temps. Still needs 1.55v for 4.8ghz. Some are just better clockers than others. It's the silicon lottery.
I'm talking proper stable as well, how many in the OP really are?

That's true. It's possible that not all the listed entries in the OP are 100% Stable.

There is no doubt that the Silicon Lottery plays a part in VCore. Is it responsible for a 0.09v difference? Highly doubtful.

@ Wolvers - have you tried any of the new BIOS's to see if that helps? I see there is another new one today too, 1201 smile.gif
Edited by ComputerRestore - 11/13/12 at 1:30pm
post #3149 of 67343
If you are going to compare voltages at a given clock, it would be best to use the voltage under load? Non LLC boards are going to have to run at a higher Vcore at idle than non LLC boards, correct?
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post #3150 of 67343
Quote:
Originally Posted by ComputerRestore View Post

Quote:
A Couple Examples pulled from the OP's OC Listing
FX-8350 4.6GHZ @ 1.5v Regular 23 200 GA-970A-UD3 / 1.1 / F7 - (No VRM Heat Sink, Poor GB Paste)
FX-8320 4.6GHZ @ 1.47v 23 200 MSI 990FXA-GD65/Rev2/V19.9 - (Fancy MSI Heat Sinks. But they generally don't seat well)
VS
FX-8350 4.6GHZ 1.356vSabertooth 990FX/Rev1/1604Bios
FX-8350 4.6GHZ 1.418vSabertooth 990FX / R2.0 / 1006
This is not an ASUS vs Others comparison. But the Sabertooth have been shown to be consistenly built well.
Not sure if these were Brute Force Overclocks. But it would be interesting to know if it is a chipset overheat issue causing the need for this type of VCore. Or if some of these chips are actually just poor overclockers.
The GA-970A-UD3 DOES have vrm heat sinks, in fact the same exact ones as the GA-990FXA-UD3. Same exact 8+2 phases too. Oh and I put 1.5v since that's what it needs in the bios. It only needed 1.44v in windows to be 100% stable. It goes to 1.44v on load due to vdroop.

And also, after putting up my pll voltage, I only need 1.4v (probably less, have not tested) for that 4.6ghz. I'm at 4.8ghz at 1.47v in windows now.
Edited by auraofjason - 11/13/12 at 2:11pm
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