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post #171 of 183
Quote:
Originally Posted by mfknjadagr8 View Post

the difference between a warm running chip and a cool one in voltage terms is negligible...
Maybe that's your experience but I have found the opposite.

Open case = much better...
Radiator outside of case = much better...
Lower-speed internal fan when air cooling = much worse...
High-speed internal fan when air cooling = much better...
Higher ambient = much worse...
VRMs with high-speed fan keeping them under 90C = much better...
keeping northbridge under 60C = much better...

... = overclock in terms of voltage+heat to performance ratio.

My experience so far has been that performance and overclocking stability are very closely tied to the amount of heat in the case, in the ambient air, and how quickly that heat is removed through the cooling system. Had my 8320E at 1.38V 4.5 GHz (HPM + Prime) stable at low ambient, with open case and ceiling fan running, and with higher-speed fan inside air cooler. Needed 1.41 with closed case, slower CPU fan, and ambient around 70F.

Not just stability but the benchmark scores... I'm tempted to just take my radiator out of the case altogether again but I'm planning to get a large external one as a supplement.
Edited by superstition222 - 11/6/15 at 6:44pm
post #172 of 183
Quote:
Originally Posted by superstition222 View Post

Maybe that's your experience but I have found the opposite.

Open case = much better...
Radiator outside of case = much better...
Lower-speed internal fan when air cooling = much worse...
High-speed internal fan when air cooling = much better...
Higher ambient = much worse...
VRMs with high-speed fan keeping them under 90C = much better...
keeping northbridge under 60C = much better...

... = overclock in terms of voltage+heat to performance ratio.

My experience so far has been that performance and overclocking stability are very closely tied to the amount of heat in the case, in the ambient air, and how quickly that heat is removed through the cooling system. Had my 8320E at 1.38V 4.5 GHz (HPM + Prime) stable at low ambient, with open case and ceiling fan running, and with higher-speed fan inside air cooler. Needed 1.41 with closed case, slower CPU fan, and ambient around 70F.

Not just stability but the benchmark scores... I'm tempted to just take my radiator out of the case altogether again but I'm planning to get a large external one as a supplement.

Agree completely. No idea where that other guy got his info.
post #173 of 183
Quote:
Originally Posted by superstition222 View Post

Maybe that's your experience but I have found the opposite.

Open case = much better...
Radiator outside of case = much better...
Lower-speed internal fan when air cooling = much worse...
High-speed internal fan when air cooling = much better...
Higher ambient = much worse...
VRMs with high-speed fan keeping them under 90C = much better...
keeping northbridge under 60C = much better...

... = overclock in terms of voltage+heat to performance ratio.

My experience so far has been that performance and overclocking stability are very closely tied to the amount of heat in the case, in the ambient air, and how quickly that heat is removed through the cooling system. Had my 8320E at 1.38V 4.5 GHz (HPM + Prime) stable at low ambient, with open case and ceiling fan running, and with higher-speed fan inside air cooler. Needed 1.41 with closed case, slower CPU fan, and ambient around 70F.

Not just stability but the benchmark scores... I'm tempted to just take my radiator out of the case altogether again but I'm planning to get a large external one as a supplement.
the guys temps were sub 50 please tell me how cooler than that would help him mitigate the problem of needing 1.5 vcore for 4.5...sure 40 vs 65c will need slightly different voltages due to what you stated but you are acting as though you can drop vcore significantly by lowering temperature 10c...it will never be that drastic unless you were running it hot and then got better cooling...again not the issue in this case...you also can't compare things apples to apples when so much I'd different..what you are describing is in all likelihood bad case airflow causing the vrms too get to hot which requires more voltage...
Edited by mfknjadagr8 - 11/6/15 at 8:48pm
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post #174 of 183
I've had instances with the FX where a 10 c drop in temps will offer up to 200 mhz of overclocking headroom. Motherboards and chips vary widely in how they are effected by temps and how it changes the voltage necessary to run at a given clockspeed.
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post #175 of 183
Thread Starter 
I can't believe how poor that 990FXA ud3 rev 4.1 was at overclocking. Especially since the board is built solid and its heatsinks could actually be touched while stress testing

But when I took the same CPU and pt it into the lesser quality 990FX Killer, my vcore necessary to stabilize 4.5 went from a sketchy 1.5 to a solid 1.35.

I have been burnt by gagabyte (yeah I spelled it that way) too many times over the last year. Even the 78lmt usb3 rev 6.0 that I was messing with a few weeks ago couldn't hold up to the abuse the rev 5.0 did before it. Perhaps I'm just unlucky... Fine, I can live with that. But the nutjobs in their BIOS department need to make an effort.
post #176 of 183
There is only one board I would buy in the AM3+ category and that is the ASUS Sabertooth 990FX r1.0 or r2.0 over that I think second would be the ASUS CROSSHAIR V FORMULA-Z but can't beat the 5 years warranty of the Sabertooth 990FX. biggrin.gif
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post #177 of 183
Quote:
Originally Posted by iRUSH View Post

I can't believe how poor that 990FXA ud3 rev 4.1 was at overclocking. Especially since the board is built solid and its heatsinks could actually be touched while stress testing

But when I took the same CPU and pt it into the lesser quality 990FX Killer, my vcore necessary to stabilize 4.5 went from a sketchy 1.5 to a solid 1.35.

I have been burnt by gagabyte (yeah I spelled it that way) too many times over the last year. Even the 78lmt usb3 rev 6.0 that I was messing with a few weeks ago couldn't hold up to the abuse the rev 5.0 did before it. Perhaps I'm just unlucky... Fine, I can live with that. But the nutjobs in their BIOS department need to make an effort.

That's good old Gigabyte! How to take a structurally good motherboard and manage to sabotage it, through inferior BIOS programming... thumb.gif
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post #178 of 183
Quote:
Originally Posted by cssorkinman View Post

I've had instances with the FX where a 10 c drop in temps will offer up to 200 mhz of overclocking headroom. Motherboards and chips vary widely in how they are effected by temps and how it changes the voltage necessary to run at a given clockspeed.
yes but not because you got a lower voltage because of the temp drop...200mhz is generally around .1v in most cases above 4.6...I'm not saying temperature doesn't matter it does but going from say 55 to 45 isn't going to net you .2v off of an overclock like this instance the board did...also the instances that have been cited have had not just one item changed so it's not a cut and dry comparison...I'd love to shave .1v of an overclock but I dropped 30 degrees off my load temps switching to water but the chip still needed the same voltage for that clock...in both instances of 8320 and 8320e...in two motherboards both the killer (which op is now using) and the sabertooth r2.0... did I get more overclocking headroom you bet did I shave off massive voltage no...
Edited by mfknjadagr8 - 11/7/15 at 12:22pm
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post #179 of 183
Quote:
Originally Posted by mfknjadagr8 View Post

Quote:
Originally Posted by cssorkinman View Post

I've had instances with the FX where a 10 c drop in temps will offer up to 200 mhz of overclocking headroom. Motherboards and chips vary widely in how they are effected by temps and how it changes the voltage necessary to run at a given clockspeed.
yes but not because you got a lower voltage because of the temp drop...200mhz is generally around .1v in most cases above 4.6...I'm not saying temperature doesn't matter it does but going from say 55 to 45 isn't going to net you .2v off of an overclock like this instance the board did...also the instances that have been cited have had not just one item changed so it's not a cut and dry comparison...I'd love to shave .1v of an overclock but I dropped 30 degrees off my load temps switching to water but the chip still needed the same voltage for that clock...in both instances of 8320 and 8320e...in two motherboards both the killer (which op is now using) and the sabertooth r2.0... did I get more overclocking headroom you bet did I shave off massive voltage no...

The closer you are to " normal" operating conditions the less it holds true. My point of reference is probably quite different from yours.
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post #180 of 183
Quote:
Originally Posted by cssorkinman View Post

The closer you are to " normal" operating conditions the less it holds true. My point of reference is probably quite different from yours.
yeah I try to stay as far as I can from the big 70 as I can and I don't think I would run over 1.61 for a daily clock...and I also try not to push things too far this id's likely where we differ I've not experienced this before because of my limits I set on myself smile.gif that said no board/chip should need 1.5v for 4.4...especially running in the 50s for temps...thanks for the insight though...what differences did you see in this instance as far as voltages are concerned?
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