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HD4850/4870 Fan Fix + OC Fix.

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if you make a profile in catalyst after turning on Overdrive( make sure clock and memory settings are correct). You can then go to the file "C:\Users\Bretware\AppData\Local\ATI\ACE\Bretware. XML. the xml file will have the same name as the catalyst profile you saved. right click and hit edit.

<Feature name="FanSpeedAlgorithm_0">
<Property name="FanSpeedAlgorithm" value="Manual" />
</Feature>
<Feature name="FanSpeedRPMTarget_0">
<Property name="Want" value="0" />
</Feature>
<Feature name="FanSpeedPercentTarget_0">
<Property name="Want" value="65" />

Change the value to "manual" and Want value to "66"

Save the file then reload your profile in catalyst.

65% seemed perfect for me, 70% was loud but you may need it if your case has poor air flow.

You will have to select the profile everytime you start the computer, but it will work until there is a fix or better info so i can figure how to change the auto target temp.
Good Luck ,bretware
Link:http://forums.guru3d.com/showthread.php?p=2751569#post2751569

Fan fix + OC on post #66!
 
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Cold Storm

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65% is pretty darn loud! This fan goes faster than it needs to. I'm idling at 35C!!:eek: Going to turn it down a little...
*65% = 4041rpm's! I'm speaking about my 4870.
 
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65% is pretty darn loud! This fan goes faster than it needs to. I'm idling at 35C!!:eek: Going to turn it down a little...
*65% = 4041rpm's!

Odd, on my Visiontek 44% was somewhere in the 4k range.
 
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ok. time to order my hd4850

edit: waiting on 1gb model
 
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Odd, on my Visiontek 44% was somewhere in the 4k range.

On a 4870? This fan is overkill, which is good. I'm at 50% and idling at 38C, FurMark under load is 55c after a few runs. This cooler works very well when the fan isn't at 16%
 
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I like.

:) HD4870
 
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nice, anyway i got zalman VF900-Cu, will transfer it over from my HD 3870 to my new HD 4870 on monday
 
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i'll be using my vf900 thats on my 3850 on my 4850 when i get it.I have modded my vf900 by putting a normal 80mm fan on it.I cut the middle bit out of the 80mm fan and glued it onto my vf900.Seems to work ok.

My 3850 runs at about 30c ish on windows.
 
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i'll be using my vf900 thats on my 3850 on my 4850 when i get it.I have modded my vf900 by putting a normal 80mm fan on it.I cut the middle bit out of the 80mm fan and glued it onto my vf900.Seems to work ok.

My 3850 runs at about 30c ish on windows.
pic of mod or it didnt happend :rolleyes:

same here 30ish with no mods ;)
even with a fan full of dust it only goes to 60c max under load
 
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On a 4870? This fan is overkill, which is good. I'm at 50% and idling at 38C, FurMark under load is 55c after a few runs. This cooler works very well when the fan isn't at 16%

Don't have a 4870 yet, that was on my 4850 during a 10 min stability test I did with Fur to see what temps were like.
 

Megasty

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Heh, I completely forgot about the overdrive profiles. Too bad I don't feel like putting the casing/fan back on the thing, plus that fan is loud as hell. For now I can deal with the thing taking up 3 slots in my rig.
 
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Uh guys, the VF900CU still wont bring satisfactory temps... I'd expect the heatpipes to be saturated with heat. Well, thats what I think at least :rolleyes:
 
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Uh guys, the VF900CU still wont bring satisfactory temps... I'd expect the heatpipes to be saturated with heat. Well, thats what I think at least :rolleyes:
well depends
 

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Uh guys, the VF900CU still wont bring satisfactory temps... I'd expect the heatpipes to be saturated with heat. Well, thats what I think at least :rolleyes:

And i still believe that a passive solution, like the Accelero S1 Rev. 2, will work just fine on these cards (and even better if you stick a fan in it).

Question: is it possible to stick an Accelero on such a card and check the idle temps only and compare them to a stock cooler @ stock speed, or does the card heat up badly on windows load that such a test is impossible without overheating the card (in case i'm wrong)?
 
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ima be sticking my Thermalright V2 on the 4850
 
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36c idle with the 4870 stock cooler, plus it blows all the hot air out of my case... I'll stick with the stock cooler!
 

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36c idle with the 4870 stock cooler, plus it blows all the hot air out of my case... I'll stick with the stock cooler!

Hadn't thought of that ...

That's quite an improvement, dude, temp wise.

How about the noise? Does it increase too much when gaming?
 

Pix

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And i still believe that a passive solution, like the Accelero S1 Rev. 2, will work just fine on these cards (and even better if you stick a fan in it).

Question: is it possible to stick an Accelero on such a card and check the idle temps only and compare them to a stock cooler @ stock speed, or does the card heat up badly on windows load that such a test is impossible without overheating the card (in case i'm wrong)?

The Accelero does work fine. Without the 140mm fan I have on it, it idled at about 50 and loaded at about 67. The fan clearly makes a big difference.
















It's now running with zero problems at 700/1100.

:rockout:
 
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BoOsTed SS

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The 4870 cooler is much better than the 4850. I wish they would have put the same on them.
 
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Hadn't thought of that ...

That's quite an improvement, dude, temp wise.

How about the noise? Does it increase too much when gaming?

At 50%, it's deffinitely noticable over my other fans, but tolerable. Since the temps never go above what the card used to idle at (16% fan), the fan just stays at 50%.


The 4870 cooler is much better than the 4850. I wish they would have put the same on them.

Price.
 

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Those temps are with the card OCed and no fan or with the card @ stock speed and no fan?

Regardless of that, you just proved my point beyond a shadow of a doubt and i thank you for it, dude!

EDIT

Another question: don't 2*120 mm fans fit, side by side, in that Accelero?
 
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Pix

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Those temps are with the card OCed and no fan or with the card @ stock speed and no fan?

Regardless of that, you just proved my point beyond a shadow of a doubt and i thank you for it, dude!

EDIT

Another question: don't 2*120 mm fans fit, side by side, in that Accelero?


No problem. :)

Those temps in the pics are with the card overclocked to 675/1050 and the 140mm fan. The passive temps were 50c idle and about 67c load. With the fan, it idled at the same speed (30c) as at stock speeds because obviously the clock is the same at 500Mhz. At 700Mhz, load jumped to about 40-41c. Either way, it runs very cool and very quiet.

I believe 2 x 120mm fans do fit on it, in fact arctic cooling do a unit with 2 of them in it that attaches to it.

I like this 140mm fan though, moves a lot of air at superbly quiet speeds.
 
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Pix

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The 4870 cooler is much better than the 4850. I wish they would have put the same on them.

Some would say price, some would say by design, given that it's the same chip as in the 4870, only lower clocked.

I believe it's by design, because the 4800 chips are very powerful. Most consumers aren't going to change the cooling on a video card, so all the more reason to slap on a cooling solution that *just* does the job, thereby eliminating the chance of a good overclock.


Just my $0.02.
 

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wait, what are you guys temps loading at stock cooler o_O, those numbers seem unreal.

edit: so the 4870s aren't THAT hot eh....
 
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