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Old 01-24-09   #1 (permalink)
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Default Biosmod overclocking HD 4850
hej I overclocked my HD4850 to 699/1099. Now I want to change the voltage of it but I dont know how. I read something about backing up the BIOS. How can I do that and how can I biosmod the GPU and raise the voltage
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Old 01-25-09   #2 (permalink)
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You need a program called NiBiTor. You can edit your BIOS through that. You flash it using a flash drive and a program called NVflash. If you need any more help, just ask.
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Old 01-25-09   #3 (permalink)
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Quote:
Originally Posted by Chandlermaki View Post
You need a program called NiBiTor. You can edit your BIOS through that. You flash it using a flash drive and a program called NVflash. If you need any more help, just ask.
Do those programs work on ATI cards? I thought those were NVIDIA only.
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Old 01-25-09   #4 (permalink)
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Here's ATI's equivallent.

http://www.softpedia.com/get/Tweak/V...S-Editor.shtml
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vista is a whore who will with whatever she gets, xp is a quick sexy lady here to get things done, but she isnt cheap so dont cheap her out either.

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Old 01-25-09   #5 (permalink)
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http://67.90.82.13/forums/showthread...190990&page=31
Read this thread.
You can't increase voltage via the BIOS.
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Old 01-25-09   #6 (permalink)
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Never done it with ATi, but NVIDIA cards let you.
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Quote:
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vista is a whore who will with whatever she gets, xp is a quick sexy lady here to get things done, but she isnt cheap so dont cheap her out either.

System: Have cash? Become an OCN member, and you wont.
CPU
[Phenom][X4][9950][Lapped][3.0GHz]		 Motherboard
[K9N2][SLI]		 Memory
[4GB][DDR2][1066][2 x 2GB] 		Graphics Card
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[160GB][WD Raptor]+[500GB][WD Caviar Green]		 Sound Card
[Creative Labs][Sound Blaster][Live!][5.1]		 Power Supply
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CPU cooling
[Thermaltake][Max Orb]		 GPU cooling
[Stock]		 OS
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[Acer][X203H][20"][1600x900]
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Old 01-25-09   #7 (permalink)
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thank you
so i am stuck with stock voltage on my saphire HD 4850 512?
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Old 01-25-09   #8 (permalink)
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Nope. Google "pencil mod 4850" and it will show you the locations for doing a cheap voltage mod for Vcore and Vmem! I have overclocked my 4850 way over what I could get with stock voltage, and have been running it 24/7 without problems. Make sure you have a good aftermarket/custom cooling solution though!

The .png I've attached is my 4850 in it's 2d clocks, but as you can see the temps are quite chilly! I don't see loaded temps over 45C even at clocks over 750.
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Biosmod overclocking HD 4850-coldcard.jpg  
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