Note for those running heavy oc'ed Quadfire 4890

[carpo93]

Lardy -

Would this mod be of any benefit if you were only using 2-3 4890?

2 i don't know

3 yes

[LardArse]

Lardy -

Would this mod be of any benefit if you were only using 2-3 4890?

Runny, just use fingers and touch the yellow wires close to the atx if they get hot during 3d loads, then it may pay off.

[Riska]

My Amd Phenom II setup with 4x4670 gfx heavly oced melted the 2 atx 12v pins in the atx socket so it is not only for the big ati cards

[STEvil]

I'm surprised the motherboard designers are so inept as to think you could pull 250w @ 12v through only two wires... let alone the poor connection they have inside the connector.

They should start adding a PCI-E 6 or 8 pin connector near the PCI-E slots.

[LardArse]

I'm surprised the motherboard designers are so inept as to think you could pull 250w @ 12v through only two wires... let alone the poor connection they have inside the connector.

They should start adding a PCI-E 6 or 8 pin connector near the PCI-E slots.

its tricky for PSUs from a particular but big OEM where its pcies are a different rail from the ATX and protects if they are in connection. Unless the atx 12v is not routed and then you will need to plug in an extra pcie con and its not optional anymore. molexes may be more compatibile, makes the board look old though

[K404]

Iv known for a while that increasing GPU loads was eventually gonna become a problem for mobo makers. I was hoping there was going to be an ATX revision to deal with this before now.

OR.... bodged solution.. as mentioned above a PCI-E power plug on the mobo

[STEvil]

its tricky for PSUs from a particular but big OEM where its pcies are a different rail from the ATX and protects if they are in connection. Unless the atx 12v is not routed and then you will need to plug in an extra pcie con and its not optional anymore. molexes may be more compatibile, makes the board look old though

Molexes will still be on the same "rail" as a PCI-E connector internally unless the particular PSU manufacturer is only putting that protect circuit on two or three of the virtual rails..

[LardArse]

Iv known for a while that increasing GPU loads was eventually gonna become a problem for mobo makers. I was hoping there was going to be an ATX revision to deal with this before now.

OR.... bodged solution.. as mentioned above a PCI-E power plug on the mobo

or cards can just draw their input for gpu memory power from the pcie connector which means 2 may not be enough. 1000+mhz, 2+v, 4GBs etcetc,

[LardArse]

Molexes will still be on the same "rail" as a PCI-E connector internally unless the particular PSU manufacturer is only putting that protect circuit on two or three of the virtual rails..

well the big powers usually have 2 rails and each one 2 virtual rails by ocp

[FatAlbert]

Dear Lard

I wanna make a post earlier but ??

When your thread up I thought about mod what you made couple years ago. PCI Express Current Booster Mod (Click! Photos down ) It's work with PCIE 2.0 ? Maybe it's another "Note for those running heavy oc'ed Quadfire 4890"

and second. Maybe atx mod work with only with couple psu's ?

[Kabauterman]

here are my pictures of the Mod:







works fine! thanks Sham

[STEvil]

It would probably be better to do the mod using a PCI-E power connector from a dead GPU because technically you are only adding a single +12v supply line by using a 4-pin molex connector.

[Kabauterman]

If u uses a PCIe Connector you add also only one 12V line, or do you think that every wire of that PCIe Connector has ists own 12V Lane

[STEvil]

If u uses a PCIe Connector you add also only one 12V line, or do you think that every wire of that PCIe Connector has ists own 12V Lane

I want you to look closely at the picture posted and this picture and tell me the difference:

[LardArse]

Stevil is right but not all power supplies can power up with the +12v of both rails joined

[carpo93]

here's my own mod to the pci-ex

it's the same of shamino mod, put is without soldering point, and it works fine on m4a79-t

[Riska]

about the Pci-e layout ?
Can i just trace the 12v pins out and solder wires to them?

[Gunslinger]

Completed this mod today, only now am wondering if I should have used heavier guage wires.

[BaRaN]

can we mode on the 24pin socket of power?



if the power have cable management we can use it to mode or not it should be fix on the board

[railmeat]

I'm surprised the motherboard designers are so inept as to think you could pull 250w @ 12v through only two wires... let alone the poor connection they have inside the connector.

They should start adding a PCI-E 6 or 8 pin connector near the PCI-E slots.

the old soket 939 dfi ultra d had a molex and a floppy power connectors solderd to there boards,is this why they did that...for sli power reasons?


http://i76.photobucket.com/albums/j1...nf4ultra-d.jpg

good thread!

[Riska]

Jep thats why to stablelise
the pci-e

[Neuromancer]

can we mode on the 24pin socket of power?



if the power have cable management we can use it to mode or not it should be fix on the board

I would not mod on the PSU 24 pin because you are still sending all that current through just the 2 pins of the port. (Which is where it burns up if I understand correctly).

Make sure your traces can handle the load as mentioned earlier in the thread. Do not want to just move the damage further along the line...

[Splave]

Apparently im retard
so do you plug the molex connector into your psu then or just leave it as it is ?

[Riska]

Yes you plug the molex into the psu the mod is made så the 2 single 12v wires get more kobber to handle the more power to feed the 4 gfx cards

[Theorw]

the old soket 939 dfi ultra d had a molex and a floppy power connectors solderd to there boards,is this why they did that...for sli power reasons?


http://i76.photobucket.com/albums/j1...nf4ultra-d.jpg

good thread!

YEP!!
They put these floppy connectors for added current and added stability when 2 power hungry cards are installed.
These connectors were also put in my previous lp dk p45 t2rs plus and also to my current LP DK X48 T2RS! just next to each PCIE slot!
I made a a custom dual floppy connector and plugged it in and i have 2 rock stable 4850s @1,4 volts each!

But i dont think well be seing floppys anymore...

I also recall my P35 DS4 having a 4 pin molex for crossfire stability...
But high end mobos today ignore these ways of extra power...