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[Official] AMD R9 290X / 290 Owners Club - Page 1494

post #14931 of 43911
Quote:
Originally Posted by ryboto View Post

Agreed, the card definitely doesn't necessarily need the boost from a clock bump, but I'm still interested in a close to max air OC. Is there a reason you choose 80C as a limit? I know they're rated for much higher temperature operation, aren't they?

The issue has more to do with efficiency. There was a chart floating around here somewhere that showed how much efficiency goes down as heat goes up. So as you push these harder it does take a toll on them. The idea is they just can't last as long at higher temps. How long is anyone's guess. After about 70c the efficiency starts dropping pretty drastically, that's why 80c makes sense from a maximum level standpoint. If you don't care much about longevity, then I say it doesn't really matter. But for maximum life below 80c makes a lot of sense. I keep mine under 60c just to be safe. But that's maybe a bit overkill, I just want this card to last a long time. I like collecting computer parts, kind of a hobby for me.
     
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post #14932 of 43911
Quote:
Originally Posted by ryboto View Post

290x is at 1200mhz core, 1500mhz ram, +143mV, +50 power. Ran Crysis 3 for 15 minutes, core hit 70C, VRM1 87C. Safe temps? I've only allowed the fan speed to reach 80% at 70C, haven't the desire to listen to 100% fans while gaming.

The VRMS are technically able to take up to 100C but i wouldnt feel comfortable doing that. If your ok with it then the card will be fine just run alittle hot, if ur not ok with it then find better cooling or lower the clocks and voltages.
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post #14933 of 43911
HardwareCanucks Sapphire R9 290 4GB TRI-X OC Review

Nice Overclock Results
Quote:
TRIXX is a relatively straightforward application which, for the time being, allows for modification of core / memory frequencies and core voltage. This is basically what AMD’s PowerTune offers but in a highly simplified and user-friendly manner.

By using TRIXX we were able to get the Sapphire R9 290 Tri-X OC we were able to hit 1251MHz on the core and 5666MHz on the GDDR5 with .085V of extra voltage. This vastly outstrips the levels attained by our reference samples and brings actual performance to some incredible levels.
post #14934 of 43911
Quote:
Originally Posted by Heinz68 View Post

HardwareCanucks Sapphire R9 290 4GB TRI-X OC Review

Nice Overclock Results

From review:
Quote:
This vastly outstrips the levels attained by our reference samples

I wonder why that is? Oh yeah...because reference have crap coolers.
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post #14935 of 43911
Whoa 1251mhz on the core, on air? Thats pretty good. Cant find any mention of VRM temps though.
post #14936 of 43911
I wish i can achieve that OC too... or at least i can get a CC 1200 stable... I'm having trouble getting CC 1170 and the increased mV of +100 is not enough in AB... Maybe that card has a high ASIC score if that matters or a really good OC. thumb.gif

This gives me a hint to use TRIXX later today and test it. By the way how many VDDC offset is (.085V of extra voltage)? rolleyes.gif
    
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post #14937 of 43911
Quote:
Originally Posted by BradleyW View Post

From review:
I wonder why that is? Oh yeah...because reference have crap coolers.

I have a R9 290 unlocked to 290x and another R9 290x, in crossfire.
With Sapphire Trixx i cannot go over 1170MHz on core and around 1300 on memory, these cards are just not good enough to OC.
I forgot, I run my own custom loop and temps are always below 50 degrees under stress so not a temp issue.
post #14938 of 43911
Got my new 290x today. Haven't had the time to install it yet but I hope it does 1150 @stock voltage. I really hope it hits 1200 once I get it under water.
     
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post #14939 of 43911
Quote:
Originally Posted by Ukkooh View Post

Got my new 290x today. Haven't had the time to install it yet but I hope it does 1150 @stock voltage. I really hope it hits 1200 once I get it under water.

1150 is a bit much to ask for at stock voltage.
post #14940 of 43911
Whats a max voltage you should aim for? Is it okay if I push it upto 200mv and see what the max clocks I will get? My card is under water.
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