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Does anyone know how to do this...........?

W

WarCon

Diamond Member
Is it possible to hook up a multifarad capacitor (like the ones used in car audio) to the 12volt powerline. I think my Enermax's (450watt Whisper) 12volt rail fluctuates enough to cause the feedback circuit in the voltage regulators for the vcore on these P4 boards to have large swings (about .13-.15). Both my P4B266A and my new 4G4A+ have had about the same swing. That I why I think its a powersupply issue. A lower power Antec had similar swing (but worse for overclocking for whatever reason). I don't want to move up to 550 or bigger just to try. But I am willing to put a large capacitor on the 12v rail if it won't mess up the powersupply or motherboard. I need to hear from people who are familar with the output stage of the powersupplies to know if this is going to throw off some spike protection or even some smoothing stage. I also don't want its keeping the mobo's 12volt alive for a short period to cause any issues.

If this is a dumb idea please let me know. Don't want to destroy anymore components in the search for more speed. I am happy right now (still testing at the moment), but I am running 2610 at 1.700vcore (thats the setting, it tops at 1.70 and 1.60vavg (load) and can hit as low as 1.57v) on my new 1.8A and new 4G4A+. I also have my poor Crucial running at 4:5 @ 145fsb, which isn't bad for PC2100. So if this remains stable through the night, then I will stay here. I am stable at 2700 with 1.75vcore, but I decided to back it down and lower the voltage a bit (once bitten..........).
 
try using all 3 power plugs on that P4B266 board.
many of us have proven that it runs better that way.

HTH 🙂
 
I was and it didn't help much (but I might of torched the processor by then). And while I should of tried my 1.8A in it while it was in my machine, I didn't. (I might later) (I really wanted my USB joystick back though, so the Epox with its 2.0's is a blessing.)

It was stable at 145fsb at 1.7v setting and the 4:5 memory timing works for my crucial PC2100 DDR so I am not really complaining. And I can run it at 150fsb at 1.75v stable (except that my CD burner flashes a few extra times when I am rebooting and then the tray opens, then the reboot closes it (any guesses? I have the bus locked so what was up there?)

It averaged 1.6v while running Prime95, which is why I thought if I stabilized the 12v input maybe the vcore would stabilize and average a little higher, but I might just be kidding myself..........


My 1.6A though is pretty much a goner. It is pretty unstable and requires significant voltage to run stable. Because the bottom outs seem to cause it to error out. It is pretty close to becoming a keychain.......🙂

On a completely different tangent, I just thought I would add that my heatspreader is not flat. There is a clear rim around the edge (not the edge but a few mm's in) and that part is even with a slight bulge over the core. It made me put on much more thermal compound than I would normally use. Anyone else with this situation?
 
with a bit of time and some pressure - that Hspreader will flatten out.
you could lap it or if your gutsy just take it off. (its been done)

HTH 🙂
 
I am not that brave anymore (I lapped my dead 1.6A and it worked really good that way, always had great contact with my waterblock). This 1.8A isn't going to go over 1.75vcore, even during testing. The temptation was there just to see if it would hit 2.8-2.9, but it isn't worth it. I think the caps on the regulators for these P4's are just too small to maintain a steady vcore. I remember my AMD's vcore use to drop during full load, but only about .04. The caps on the three P4 boards I have seen and used are all smaller than the AMD ones.

This may not be a "super" overclock, but a stable 2.61 with DDR362 (especially done with PC2100) isn't a bad one either.

Sandra scores aren't Thugsworthy.......🙂, but not bad.

CPU 4972/3185
Multi 10277/12854
Mem 2765/2784

9034 3Dmarks with a GF3Ti200 220/500
 
Forgot that I had one more question. This 4G4A+ temps are higher than I expected, but act more like they are being read from a diode (fluctuation is fast) compared to my P4B266-C. Are we sure the P4B266-C wasn't using some kind of compression and maybe adjustment. The temps did read pretty low, even with the stock heatsink. I am running a AX-478 and an Thermaltake SMART CASE FAN II and the temps on the retail fan were similar, except the idle temps on this one are very much different. Thats why I think one of these sensors is either adding or subtracting or compressing data from the internal diode. I think the ASUS board is actually adjusting the real temp for whatever reason.

Just wondered if you noticed anything like this.

I had a temp swing of ~20C with stock fan

and about ~12C with the above combo on a quiet setting.

The swing amount sounds about right, but the ASUS boards idle temp was about 10C less.
 
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