I have the XFX 5850 and its stable at 370 Mhash OC to 895 on the core and 300 on the memory.
http://techheadsblogs.com/images/5850.png
Topic: 5850 xtreme (Read 2403 times)
900 MHz
howw about : Accelero Twin Turbo Pro
One final thing, the stock coolers on the Sapphire HD5850 Xtreme cards are known to fail if they are set to 100% speed for a few weeks.
Where did you here this? A GPU fan should last a few years running at 100%.
From these forums (I've been away for 2 weeks and don't have links for the threads). I've just re-read my statement and it's not really fair. I don't mean to imply that all 5850 Xtreme coolers will fail within a few weeks if left at 100%, just that more than a few have failed. I certainly didn't struggle to sell my 5850 Xtreme coolers after I'd installed my Zalmans.
OK. I guess I should be careful with mine. Thanks for the warning.
90c is absolutely fine. If Sapphire or ATI thought 90c was unsafe, they would have designed their software to throttle the card sooner. As it is, it only starts throttling clockspeed when it hits 91c. I would feel comfortable up to 100c before I started worrying, as I'm sure Sapphire/ATI also builds in a little "safe zone" as well.
Everyone gets so dang paranoid about GPU temps.
Everyone gets so dang paranoid about GPU temps.
I'm a nervous kind of guy
One final thing, the stock coolers on the Sapphire HD5850 Xtreme cards are known to fail if they are set to 100% speed for a few weeks.
Where did you here this? A GPU fan should last a few years running at 100%.
From these forums (I've been away for 2 weeks and don't have links for the threads). I've just re-read my statement and it's not really fair. I don't mean to imply that all 5850 Xtreme coolers will fail within a few weeks if left at 100%, just that more than a few have failed. I certainly didn't struggle to sell my 5850 Xtreme coolers after I'd installed my Zalmans.
One final thing, the stock coolers on the Sapphire HD5850 Xtreme cards are known to fail if they are set to 100% speed for a few weeks.
Where did you here this? A GPU fan should last a few years running at 100%.
If you are using a regular case, make sure you have enough out-ventilation in it, as the Xtreme pushes only a margin of the heat generated out through the bracket.
Preferable is to run it in an open case solution, as the fan is acceptable(not quiet though) at 100%.
What is your max stable core at stock voltage?
Bumping voltage on the Xtreme(any 5850?) makes the watt-usage skyrocket, not worth bumping voltage for a 5% hash-increase if you end up with a 30% higher watt-usage. (all fictional numbers)
Preferable is to run it in an open case solution, as the fan is acceptable(not quiet though) at 100%.
What is your max stable core at stock voltage?
Bumping voltage on the Xtreme(any 5850?) makes the watt-usage skyrocket, not worth bumping voltage for a 5% hash-increase if you end up with a 30% higher watt-usage. (all fictional numbers)
I agree with this general sentiment. With the prices of Bitcoin as they are right now you could easily find that you make more by lowering the voltage and you won't have to sacrifice many Mh/s for large power savings.
As I said, I'm running both cards at 0.9875V and I'm still getting 733 Mh/s in total but the miner is only pulling 300-302 watts from the wall (and that's using an ordinary HDD and a Silver certified PSU).
90c is absolutely fine. If Sapphire or ATI thought 90c was unsafe, they would have designed their software to throttle the card sooner. As it is, it only starts throttling clockspeed when it hits 91c. I would feel comfortable up to 100c before I started worrying, as I'm sure Sapphire/ATI also builds in a little "safe zone" as well.
Everyone gets so dang paranoid about GPU temps.
Everyone gets so dang paranoid about GPU temps.
I love the idea of 1160 volts on a GPU. GO man go! I'm sure that won't be a problem.
I don't know anything about overvolting but that's only a 6.6% increase from stock. That doesn't seem like too much. I may be wrong though.It doesn't seem so bad to me, even for 24/7 usage. 90*C makes me nervous though and I would consider lowering the voltage just to get a handle on the temperature. If you can find a way of cooling the card to 75*C or below and keep the 1.1625V then more power to you!
(I believe the VRMs on these cards work in increments of 0.0125V so if you tell the cards to run at 1.16V they'll probably be at 1.1625V. Again, I could easily be wrong; I have no source for this).
temp is much
not safe 24/7
buy zalman vf3000a
or run it at 900 mhz with less voltage
not safe 24/7
buy zalman vf3000a
or run it at 900 mhz with less voltage
Careful with this, the Zalman VF3000A is designed for reference 58xx cards and the Sapphire HD5850 Xtreme is far from reference. I've attached these coolers to my Sapphire Xtreme 5850s but:
- I had to leave the existing heatsink in place for the VRMs,
- the coolers make the cards about 3.5cm longer,
- the coolers use 3-pin fan connectors but the Xtreme cards use 4-pin fan connectors so I use manual fan control.
I have some pictures here.
With these coolers in place and a fan-heater set to cold focused on the VRMs of one card I was able to take the card to 1.3V (Catalyst 11.6 + AMDOverdriveCtrl wouldn't let me go any higher) and the card ran fine for 3 hours at 1110MHz, 1.25V (461.1 Mh/s) and maintained a temperature of about 50*C.
For 24-7 use I would draw the line at 80*C and would try hard to keep the GPU temps below 75*C. I'd also limit myself to 1.1625V. At 90*C I would expect the life of the card to be shortened significantly but I'd guess it would run fine for many months. I'm certainly no authority on the subject though.
Personally I keep my two cards at 0.9875V (the cores are at 847 MHz and 899 MHz). For this the Zalman coolers can keep the cards at 58*C and 44*C respectively when turned down to the minimum I can with the manual controllers.
One final thing, the stock coolers on the Sapphire HD5850 Xtreme cards are known to fail if they are set to 100% speed for a few weeks. From what I've read on the forums I'd be uncomfortable having them above 80% continuously.
I love the idea of 1160 volts on a GPU. GO man go! I'm sure that won't be a problem.
I don't know anything about overvolting but that's only a 6.6% increase from stock. That doesn't seem like too much. I may be wrong though. 
I love the idea of 1160 volts on a GPU. GO man go! I'm sure that won't be a problem.
935mhz for stock voltage
sapphire HD5850 xtreme card
one question
1160volt, 970mhz core, 300mhz
guiminer with phatk
results:
90degree celsius
401mh/s +/- 1mh/s
safe?
i just feel 90degree too high, any suggestion voltage and core speed i can go for for hd5850 xtreme sapphire
one question
1160volt, 970mhz core, 300mhz
guiminer with phatk
results:
90degree celsius
401mh/s +/- 1mh/s
safe?
i just feel 90degree too high, any suggestion voltage and core speed i can go for for hd5850 xtreme sapphire
If you are using a regular case, make sure you have enough out-ventilation in it, as the Xtreme pushes only a margin of the heat generated out through the bracket.
Preferable is to run it in an open case solution, as the fan is acceptable(not quiet though) at 100%.
What is your max stable core at stock voltage?
Bumping voltage on the Xtreme(any 5850?) makes the watt-usage skyrocket, not worth bumping voltage for a 5% hash-increase if you end up with a 30% higher watt-usage. (all fictional numbers)
without overvolting, i can use the xtreme 5850 with 900,300 mhz at 368 Mh/s. In my case the temperature is 62 - 67C with 80% fan speed. Card runs one month 24/7 without any problems now.
Accelero Twin Turbo Pro does same job?
usually max we can go with : ZALMAN VF3000A
is how much core
is how much core
temp is much
not safe 24/7
buy zalman vf3000a
or run it at 900 mhz with less voltage
not safe 24/7
buy zalman vf3000a
or run it at 900 mhz with less voltage
sapphire HD5850 xtreme card
one question
1160volt, 970mhz core, 300mhz
guiminer with phatk
results:
90degree celsius
401mh/s +/- 1mh/s
safe?
i just feel 90degree too high, any suggestion voltage and core speed i can go for for hd5850 xtreme sapphire
one question
1160volt, 970mhz core, 300mhz
guiminer with phatk
results:
90degree celsius
401mh/s +/- 1mh/s
safe?
i just feel 90degree too high, any suggestion voltage and core speed i can go for for hd5850 xtreme sapphire
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