Overclockaholics Forums - 5870 and 5970 voltmods guide

Hi, Crusty. Looks nice!:)

I need some help. I'm not sure how many caps I need. I've spoken to TiN about some caps for Vmodding the 5870. He would have gone for some 560UF 4v from Os-con.
SANYO OS-CON SP Conductive Polymer 560uf / 4vdc

I will probably get another brand with same values, but that's not very important as long they are good caps.
I'm going to order some stuff from my local TV/radio man, he's a good guy. Very helpful...

There are 6x power phases for GPUv output...there are 2x for vmem output.. me thinks 4x GPUv input and 1x vmem input, right?

And this is also true?
- Cap GPUv output phases.. at least 1x cap per phase..[back side of PCB]
- Cap both mem phases, 2x caps per phase [front side of PCB]

Could you help me out clearing this up? I'm new to the game, and I just know how to solder. Not much more..just easy basics.

Quote:

Originally Posted by TiN

As for value, it's not very important exact capacity value. You can use 220uF or 100uF or 470uF. More >>> better >>> but also larger cap. You will be nice if have ~1000-2000uF on each phase. More - can be bad, coz more capacity = more loading for FETs to drive energy fast.

Thing you have to take care - working voltage. On GPU's/CPU's usually upper limit is 2V, but you should have some space to be safe. So 4V caps are nice here.
For mems voltages are 1.5-2.5V, so I would use 4V, better 6.3V here.

Fujitsu RE 6.3V 1000UF Aluminum solid capacitors

So how many caps will I need of each value and voltage?
I will also order a 50 Ohm VR. I've also heard you need a e 20k for OCP?

Man I'm confused. What would be the best 4v or 6.3v for this volt mod?

HI got a few caps from a dead MSI Motherboard, anything usefull?
http://img121.imageshack.us/img121/8494/img4474u.th.jpg

Best Regards Kriztoffer.