Radeon 3870 Component Question

[MagnumMan]

I'm getting into hardmodding Radeon 3870s. I have 5 of them, 4 are in a rig for CrossfireX. One spare.

I will be upgrading capacitors that fit in the same place as the existing ones. I am:

Upgrading the 180uf 16V to 330uf 16V
Upgrading the 820uf 2.5V to 2200uf 2.5V (and filling in one empty one near the top of the board)
Installing the "missing" 6.5mm x 6.5mm SMT with 16V 220uf
Also installing trimmers for Vgpu and Vmem.

I'm curious about the four large square items on the board. They are labeled R47 738 M3K. I might want to replace these with something a little larger and more stable if it makes sense to do so. I have about 1.5mm to 2mm of clearance under my Koolance water blocks for these. What are these and what are the specs?

Thanks...

[G.Foyle]

Those are inductors (coils), replace for higher inductance to get less ripple. I dont know the specs though.

[MagnumMan]

Well on my test subject card, stock cooling, I have trimmers on it now and got it at 1.5V / 2.05V and 910/1210 speeds. It gets damn hot though, at idle it is at 1.2Vgpu and 300MHz and seems to be reasonable there. I haven't heard the fan kick into full speed yet though. This was a starting step for what I'm eventually going to do on my 4x 3870s in K9A2 Platinum water cooling. I'd like to get 4x running at 1000/1200 at a minimum. Then my Phenom 9600 at 2.75GHz can choke the system into posting a mediocre score. :>