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View Full Version : Very weird problems with PC6400C5 v4.1 and P5B Deluxe


Bootup05
03-17-2007, 02:39 PM
Hi people, having a really weird issue here ATM on my P5B Deluxe.

Well heres the problem.

Im using Bios 1004

Just first to let you all know my ram uses Qimonda IC's.

The past couple of months ive been using my system rock stable at 3.5GHz, 438*8, ram at 876MHz.

This ram is rated at 5-5-5-12-T1 - I have it running synced to the SPD, which automatically sets it to 5-6-6-18-T2.

So, today I set my system back to stock, and booted away from the SPD, at 5-5-5-12-T1, the boot was fine. Was using 2.1vdimm as Corsair Reccommends on their forum. I can boot absolutley fine up to 380FSB, thats when I have trouble.

I then tryed booting at 6-5-5-12-T2, this makes no difference at all.

So all I have found out is that, this ram, rated at 5-5-5-12-T1, wont even run at Stock, 800MHz at much looser latencies of 6-5-5-12-T2.

Does anyone else have this problem? I have had a look around the Corsair forum and seen that theres a few guys on their with sort of the same quirks.

Is it just that these sticks are exceptionally bad at overclocking, or is there another problem somewhere.

Surely, if the rams rated at a certain speed, booting with SPD timings enabled will let the sticks boot at them latencies.

I'm not sure but could this be a compatibility problem between the sticks and board?

Thanks

Also, another weird thing is, when you try to boot this board with the multi on Auto, if I set my ram to stock (Manual) 5-5-5-18, my cpu jumps around from 2200MHz - 3100MHz (6x / 8x multi):confused:

Last thing, seing as this board will never run ram at the specified Corsair ratings, theres no way to get the ram running at 1T, will this ever be sorted out?

Yellowbeard
03-18-2007, 10:25 AM
Most manufacturers using Intel chipsets do not allow for adjusting command rate. I have seen a couple of cases where it's been tried but it has typically been unstable to run 1T on Intel chipsets. I don't see any sign of this improving with the current chipsets.

With your memory, try testing each DIMM individually with the RAM timings set manually, the RAM voltage set manually to 2.1v, the CPU at stock speed, and legacy USB support disabled in the bios. Test each dimm for 3-5 passes each.