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Author Topic: 7950 problem ! [solved]  (Read 1101 times)
mig91
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April 13, 2013, 03:28:03 PM
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so i bought 4x vtx7950s to my litecoin mining rig and everything was fine until i see them power usage... my whole 4x7950 rig eats ~1300watt @ c935/m1300/v.stock. (stock clocks are c930/m1250) and they are voltage locked!

so are bios changing the only way to unlock voltage control ?
what vga bios you recommend ?

i really want the cards eating less than 300w each  Tongue

edit. 7950 bios list:
http://www.techpowerup.com/vgabios/index.php?page=1&architecture=ATI&manufacturer=&model=HD+7950&interface=&memSize=0
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Gator-hex
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April 13, 2013, 03:34:11 PM
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Try turning the memory clock down and see if that helps.

mig91
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April 13, 2013, 03:59:47 PM
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Try turning the memory clock down and see if that helps.

i tryed c910/m1050. still eating 270w per card and hashing only 433kh

hmm i really need unlock that v. control, but how ??
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April 13, 2013, 06:45:54 PM
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problem solved. thanks to sapphire trixx !
superfastkyle
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April 13, 2013, 07:51:28 PM
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You must have one of the 7950's that defaults to 1.25v. Yea you can probably just undervolt with trix but a better solution is a 7970 bios. I have the HIS IceQ 7950 I used the bios from the HIS IceQ x2 7970. I assume you probably can use any reference 7970 bios if yours is a reference 7950 otherwise you probably need to stick with the same brand if its a non-reference. Power usage is around 170w now per card, instead of 250w.
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April 13, 2013, 09:26:22 PM
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You must have one of the 7950's that defaults to 1.25v. Yea you can probably just undervolt with trix but a better solution is a 7970 bios. I have the HIS IceQ 7950 I used the bios from the HIS IceQ x2 7970. I assume you probably can use any reference 7970 bios if yours is a reference 7950 otherwise you probably need to stick with the same brand if its a non-reference. Power usage is around 170w now per card, instead of 250w.

im happy with trixx. i undervolted and little overclocked cards and i made -300w in power usage. now that rig is pulling about 980w Smiley

gonna fix it some more tomorrow

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