3870X2 voltmod thread

[T_M]

560uF 6.3V solid caps from dead mobos.

[LardArse]

i've done the same pcie chip vmod and it worked, hipro has similar mod too, i dont understand, how 200ohms feedback with 5k to ground can raise pcie chip volts to 2.4v? it barely raised a bit over default for me.

[Jigsaw]

Does it increase stability enough to be worth it?

Will LF 560 752 work?
Will PS735 330 16v work?
Is there any special order or places to solder them on the vGPU/vMEM resitors?

[youngpro]

sorry peter i must have overlooked something or made some stupid mistake, its all i can see as the problem, the base resistance is just over 200ohms, perfect for 5k resistors, yet ive tried a few times and it gives me 2.4v every time...

[T_M]

Hey Shams, do you have any advice on other good locations to add capacitance?

[LardArse]

SMDs right behind core would be good, but i think u'd better off looking to add mosfets and inductors curently

[Jigsaw]

SMDs right behind core would be good, but i think u'd better off looking to add mosfets and inductors curently

I am not a skilled solderer, how difficult would that be and if too difficult, what are good caps to use and can you post a pic with the spots labeled for both MOSFET and caps? Also, can you link me to a MOSFET that would be good? Thanks guys!

[LardArse]

I am not a skilled solderer, how difficult would that be and if too difficult, what are good caps to use and can you post a pic with the spots labeled for both MOSFET and caps? Also, can you link me to a MOSFET that would be good? Thanks guys!

heheh thats the tough part, even for hipro5 maybe he will move the mosfets from a dead 2900xt to it, theres bare spots for another one two phase, thats the beauty of volterra u can daisy chain the mos, up the phases

[Jigsaw]

What capacitors should I use?
Where do I solder them?
How many should I use?

This card will only be under water and maybe the ocassionally "winter chilled" water.

[Riska]

Lardarse do you have some more mods for the 3870 gfx than them you posted at foxcons forums?

[Astennu]

What kind of bios are you guy's using in your cards ? because when v-modding you certainly gonna get over 860 mhz. I'm stuck there and want to get past that speed

[Riska]

Just try to set it at 899mhz there is a bad spot at 860mhz on some cards

[Astennu]

uhmm i can try but 870 and 880 both failed with a instant lock and i heard these cards also had the 860 mhz lock in the bios.

[trans am]

subscribed

[harleybro]

Stock bios worked fine for me vmodded and 970 core.

[R*r]

stock bios n unmoded i can run 918/1100 lucky can pass the 860...

[T_M]

Someone pleeeease post up the OCP mods again for GPU. Desperately need to try them

[Riska]

http://forum.foxconnchannel.com/Titl...w+just+Dry+Ice

Here u go

[T_M]

3870X2
Regarding my cap mods, i did not see any obvious gains on either GPU or Mem, however i also dont know if im simply being limited by OCP...

[Astennu]

Stock bios worked fine for me vmodded and 970 core.

Uhmm. Guess i should try some more then but i dont think i'm so lucky to hit 900 or a bit more.

[Jigsaw]

http://forum.foxconnchannel.com/Titl...w+just+Dry+Ice

Here u go

Link is bad.

[Riska]

link is ok!

[T_M]

Link is not OK, it is not even to X2 thread

[Riska]

It is a link to the ocp mod

[T_M]

Errr, the thread is titled "3870 @ 1200MHz Core w just Dry Ice" and contains 3870 mods man
You need to check what this thread is titled, 3870X2