Mallet
Have you or anyone else got a chipset volt mod for this mobo?
I think that a chipset voltage boost is the main thing needed to get this motherboard anywhere near the 340FSB that the bios supports.
Its the first time i post here and i wish to say that you have here an nice community, full of friendly people. Also I wish to say that you have an awesome forum
I am another 775DUAL-VSTA user, and I think that will be more like me, because we have lots of people with good graphic cards and good DDR kits and we are not willing to give up of that. That board allow us to keep the "old" hardware and upgrade to the awesome Conroe . Its an ship mobo and i think that represents the icon of an board to overclockers, because its cheap and it uses "old" tech. Plus if we could manage to control fsb/mem ratio, Vcore and an FSB about 400 that will rock a lot of PCIe and DDR2 systems.
As it is now I could obtain the following results:
So what do you think its an powerfull but cheap upgrade (about 195 € for CPU and 55 € for Mobo) from "old" intel and AMD systems, isnt it?
The voltage measure points for them are: Vagp --> the upper leg of the mosfet between the pci-e slot and the agp slot. I had to take out my agp card and power up the system to check this voltage with the multimeter
Vnb --> the upper leg of either mosfet between the northbridge heatsink and the 20pin molex connector.
To raise Vagp shade the resistor shown in the picture from 1.88 k ohms to ground down to 1.75 k ohms for about 1.7volts. This was with agp set to normal in bios. Be carefull and check resistance before powering on, it only takes one or two pencil strokes as the resistance is high allready. This mod hellped me get past 306fsb to about 318fsb, I need to do some stability testing though, but before I could not boot into windows at 308fsb. I think I may actually be running into the limit my e6600 will do at 2.86ghz on stock vcore.
To raise Vnb shade the resistor shown from 990 ohms to ground down to about 940 ohms to ground for about 1.4-1.45 volts, stock is 1.35v. This mod did not help me to overclock FSB, it actually hurt stability. I'm just posting in case someone wanted to try with theirs and see how it worked.
Also some oc hints for the 775dual-vsta. In the Bios set:
it was my pleasure, thank shamino for posting his how to guides for volt modding, as they were a great starting point.
V-link is how fast the northbridge and southbridge comunicate. I suppose it would be similar to lowering the multi for nb to sb link on an a64 system. I can leave it on fast up to about 307fsb
Vagp mod will not help you to overclock your video card, It helped me to overclock my motherboard. For that you need to find the volt mod for your card. For x850xt someone must have done one allready.
Hmm,, I think it is. I however am running an agp 6600gt and ddr1. yet setting the pci-e speed to 117 helped even though im running an agp card. This board is realy quirky, the best way to find out is to try it out and see. Just be carefull not to drop resistance too low and check the voltage at startup with a multimeter.
With 324 it hold 15 minuts in prime with 320 it holds 1h30m. Now i've made some changes in bios configuration (including loosening memory timings) and i'll see how it holds
Last edited by paivajo; Sep 24th, 06 at 07:14 PM..
Considering the resistor location and the effects of this volt mod I think what you call of Vagp volt mod its in reality an Vfsb volt mod that regulate the communication between memories and chipset, what do you think?
Considering the resistor location and the effects of this volt mod I think what you call of Vagp volt mod its in reality an Vfsb volt mod that regulate the communication between memories and chipset, what do you think?
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