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Soldering an 8 pin to 4890?

post #1 of 18
Thread Starter 
Hey guys, Ive got 2 4890's. One is an OC model with a blue PCB and 6+8pin, and the other is stock with red PCB with 6+6pin. From what I've read, when an 8pin is in use, it delivers 150w instead of 75w when a 6pin is used, so.....

If I took the 6 pin off the stock red card and soldered on an 8 pin in its place, would it allow me to overclock it further? The PCB on the red one has the contact points for an 8pin to be put on instead of the 6pin, and from what I can see, the components on the board are identical, so im guessing it would be as simple as soldering on the 8pin then flashing the bios to the OC models bios so it uses the 8pin?

My blue PCB one can do 1ghz @ 1.4v with a volt mod but the red card doesnt like me messing with the voltage, I'm assuming because the 6+6 cant deliver enough power for it? Id love to have 2 4890's @ 1ghz

Cheers, donk
    
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post #2 of 18
I don't see how that is possible since the other 2 pins are just ground pins...
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post #3 of 18
If you arent afraid to risk that GPU and there is a place were you can solider an 8 pin up to I guess you can try, although there may be points on the PCB that wouldn't allow power from the additional 2 pins to flow to the card
post #4 of 18
It might be possible that the addition of more grounding circuitry means it can draw more current (from the equation of current drawn=current sinked, both in heat and grounded means).

Who knows if the 6+6 has a weaker power phase design compared to the 6+8.

I wouldn't try to invent any much. Sell your 6+6 and buy a 6+8, easier, safer.
   
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post #5 of 18
8 Pin are just able to deliver more power, doesn't mean that your GPU can make use of the power. The other 4890 probably has a lot of other special components to work along side of that 8 + 6 pin connector such as higher quality caps, better quality memory, more power phases, ect. - it probably isn't possible, but hey if you have nothing to lose, check for the soldier points, if they are there, go to town, this is OCN so we do crazy things (just try to use logic, crazy should go with logic )
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post #6 of 18
Thread Starter 
Cheers for the replys. Im getting my information from here about the 8 pins providing more power. Like Artikbot said, I think its to do with the extra grounding allowing for more current because the max current is double on the 8 pin according to the table.

I guess ill have a closer look at the PCB's later, but from what I remember, they looked identical other than the 8pin, also, if it doesnt work using the 8 pin, i can just plug the 6 pin into the 8 pin port, my blue PCB card is just using 2 6pins at the moment and runs fine, but just wont overclock/overvolt like when it has the 8 pin in.

Quote:
Originally Posted by Artikbot View Post
Sell your 6+6 and buy a 6+8, easier, safer.
I would do this but these 8pin oc models are quite rare from what I can tell, took me a long time just to find out about the sapphire OC's with 8pins, most people who bought OC's had only 2 6pins like my stock one. Once i get enough rep, ill have to make a thread in the Wanted section.
    
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post #7 of 18
Quote:
Originally Posted by donk165 View Post
I guess ill have a closer look at the PCB's later, but from what I remember, they looked identical other than the 8pin
They will look very similar in shape. The difference is the brand,mode, and quality of the components used.
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post #8 of 18
Thread Starter 
Quote:
Originally Posted by xsever View Post
They will look very similar in shape. The difference is the brand,mode, and quality of the components used.
Your right, I've just taken a look at my blue one with the 8 pin. I compared it to a print out of the Sapphire Toxic PCB, and my blue board matches that one 100%, but it doesnt match my stock red one. The differences are very slight, the large chip on the front are different brands, and a few of the tiny components dotted around are either present or not present.

Front: Stock - Toxic
Back: Stock - Toxic

I'm guessing Sapphire had spare Toxic PCB's lying around and just put a stock cooler on it rather than the Toxic/Vapor-X cooler and called it an OC model? Or the other way round? I guess that explains why when I flashed the blue PCB card to the Toxic bios, it worked fine, was just quite warm, probably because the stock cooler cant handle the extra voltage.

Oh well, I guess ill have to find someone whos got a Toxic or an OC model who wanted a slight downgrade for lower temps or something, very very unlikely
Edited by donk165 - 4/15/11 at 1:14pm
    
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post #9 of 18
Quote:
Originally Posted by donk165 View Post
Hey guys, Ive got 2 4890's. One is an OC model with a blue PCB and 6+8pin, and the other is stock with red PCB with 6+6pin. From what I've read, when an 8pin is in use, it delivers 150w instead of 75w when a 6pin is used, so.....
That can't be right... I have 2 6pins instead of two 8 pins plugged into my 6990, both using the 6 to 8 pin adapters. If it's giving half the power, it seems like my 6990 wouldn't even turn on.
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post #10 of 18
Thread Starter 
Quote:
Originally Posted by derickwm View Post
That can't be right... I have 2 6pins instead of two 8 pins plugged into my 6990, both using the 6 to 8 pin adapters. If it's giving half the power, it seems like my 6990 wouldn't even turn on.
Well from what I've been reading from here, the max wattage of 6 pins is 75w, and the max wattage of 8 pins is 150w. The extra 2 grounding wires allow the graphics card to draw more current.

I'm guessing using those adaptors is putting more strain on the PSU if your using the 6 pin lines with adaptors, hopefully the PSU is designed to handle the extra current on those 12v lines.
    
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