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post #181 of 183
Quote:
Originally Posted by mfknjadagr8 View Post

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?

First off, I'm not all too sure different motherboard manufacturers are honest ( maybe accurate is a better word? ) with their temp and voltage reporting. I know some versions/bios of the Crosshair were pushing almost .1 more voltage than reported when testing with a multimeter. The current MSI 990FXA Gaming I'm testing reports it is pushing an incredibly steady 1.64 volts to the core, but it lags behind the GD - 80's stable clocks by .05 volts at 5.1 ghz with the same chip ( meaning the 80 can do it with 1.59 volts and much more modest cooling ) so I'm left to wonder if it is an accurate reading. Given the same voltage the GD80 has about a 200 mhz advantage above the voltage wall on that early batch 8350.

Using the GD-80 with voltages above the "wall" on particular chips and water cooling in sub zero ambient's on benchmarks , not stability programs. The first runs I could get away with 1.67 volts at a given clockspeed while the liquid was cold and load temps were below 20 C, subsequent runs ( wprime @ 5.6 ghz for example) I'd have to add voltage to finish them. Eventually load temps got to around 40C and voltages were at 1.72 at which point , everything in the system was straining pretty hard and I decided it was time to say "uncle".
The next time I had a cold start , I tried dropping clockspeed rather than upping voltage and 5.6 runs at 20C were landing at 5.4 or so when temps got above 30. Not a terribly scientific endeavor, maybe I should give it another go this winter and keep better records of it.

Personally , I've seen things get out of whack at temps above 50c on amd chips going back to 940 deneb, but I'm sure part of that is due to not using boards with LLC. But my undies still start to get all up in a bunch when I see core temps go above 50.
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post #182 of 183
Quote:
Originally Posted by cssorkinman View Post

First off, I'm not all too sure different motherboard manufacturers are honest ( maybe accurate is a better word? ) with their temp and voltage reporting. I know some versions/bios of the Crosshair were pushing almost .1 more voltage than reported when testing with a multimeter. The current MSI 990FXA Gaming I'm testing reports it is pushing an incredibly steady 1.64 volts to the core, but it lags behind the GD - 80's stable clocks by .05 volts at 5.1 ghz with the same chip ( meaning the 80 can do it with 1.59 volts and much more modest cooling ) so I'm left to wonder if it is an accurate reading. Given the same voltage the GD80 has about a 200 mhz advantage above the voltage wall on that early batch 8350.

Using the GD-80 with voltages above the "wall" on particular chips and water cooling in sub zero ambient's on benchmarks , not stability programs. The first runs I could get away with 1.67 volts at a given clockspeed while the liquid was cold and load temps were below 20 C, subsequent runs ( wprime @ 5.6 ghz for example) I'd have to add voltage to finish them. Eventually load temps got to around 40C and voltages were at 1.72 at which point , everything in the system was straining pretty hard and I decided it was time to say "uncle".
The next time I had a cold start , I tried dropping clockspeed rather than upping voltage and 5.6 runs at 20C were landing at 5.4 or so when temps got above 30. Not a terribly scientific endeavor, maybe I should give it another go this winter and keep better records of it.

Personally , I've seen things get out of whack at temps above 50c on amd chips going back to 940 deneb, but I'm sure part of that is due to not using boards with LLC. But my undies still start to get all up in a bunch when I see core temps go above 50.
sub ambient seems to bring it out like crazy.. thats a pretty big difference...i havent taken the plunge to go soldering on the kitty to get some solid testing points for the multimeter so i might not ever see if my voltages are whats advertised.. ive considered it but knowing my luck i would short the wrong thing and kill the board lol.. i wasnt aware the differences when going sub ambient and sub zero were that large... i doubt i will ever go sub zero or sub ambient...simply because the cost and risk is too great for me....but im always intrigued to see the results of these tests...thanks for the information smile.gif
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post #183 of 183
Quote:
Originally Posted by mfknjadagr8 View Post

Quote:
Originally Posted by cssorkinman View Post

First off, I'm not all too sure different motherboard manufacturers are honest ( maybe accurate is a better word? ) with their temp and voltage reporting. I know some versions/bios of the Crosshair were pushing almost .1 more voltage than reported when testing with a multimeter. The current MSI 990FXA Gaming I'm testing reports it is pushing an incredibly steady 1.64 volts to the core, but it lags behind the GD - 80's stable clocks by .05 volts at 5.1 ghz with the same chip ( meaning the 80 can do it with 1.59 volts and much more modest cooling ) so I'm left to wonder if it is an accurate reading. Given the same voltage the GD80 has about a 200 mhz advantage above the voltage wall on that early batch 8350.

Using the GD-80 with voltages above the "wall" on particular chips and water cooling in sub zero ambient's on benchmarks , not stability programs. The first runs I could get away with 1.67 volts at a given clockspeed while the liquid was cold and load temps were below 20 C, subsequent runs ( wprime @ 5.6 ghz for example) I'd have to add voltage to finish them. Eventually load temps got to around 40C and voltages were at 1.72 at which point , everything in the system was straining pretty hard and I decided it was time to say "uncle".
The next time I had a cold start , I tried dropping clockspeed rather than upping voltage and 5.6 runs at 20C were landing at 5.4 or so when temps got above 30. Not a terribly scientific endeavor, maybe I should give it another go this winter and keep better records of it.

Personally , I've seen things get out of whack at temps above 50c on amd chips going back to 940 deneb, but I'm sure part of that is due to not using boards with LLC. But my undies still start to get all up in a bunch when I see core temps go above 50.
sub ambient seems to bring it out like crazy.. thats a pretty big difference...i havent taken the plunge to go soldering on the kitty to get some solid testing points for the multimeter so i might not ever see if my voltages are whats advertised.. ive considered it but knowing my luck i would short the wrong thing and kill the board lol.. i wasnt aware the differences when going sub ambient and sub zero were that large... i doubt i will ever go sub zero or sub ambient...simply because the cost and risk is too great for me....but im always intrigued to see the results of these tests...thanks for the information smile.gif

Mine is a fairly narrow perspective, only using similar chips with the same motherboard, power and cooling. It may have something to do with being very close to the motherboards capability to deliver clean power. I really haven't taken the time to study the differences using my other 990 boards being paired up with the same supporting cast under the same conditions.
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