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E6420 overclocked on Asus P5B Deluxe problems

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April 30, 2007 7:13:54 PM

Here's my new computer I bought last week:

Asus P5B Deluxe
2x1GB OCZ PC2-6400 Platinum Rev. 2 4-4-4-15
Intel E6420 with a Scythe Ninja Rev. B
e-VGA GeForce 8800GTS Superclocked
2 x WD 320GB (AAKS versions)
all this in a big Antec P180


When I boot without overclocking it, I have a 266MHz fsb and I choose DD2-800 so it load normaly. But, when I overclock it to 333MHz (like in the overclocking guide), I put my memory to 1:1 and instead of showing PC2-5400, it's showing PC2-4300. And when I get it to 350, 375 and 400, it's still PC2-4300. In CPU-Z, the speed of the memory is OK. Is this normal?

Also, I run 3DMark06 to test this system. At 266 MHz, my score is 8874. At 333 MHz, score is 9586, but higher than this (like 350), I get a score in the 3000. Running 2 instances of Prime95 shows it's stable. But why do I get a score so low? Any idea?

Thanks for the help.
April 30, 2007 7:43:47 PM

I had a similar problem with my memory. Go into the Bios and take it off that SPD setting and set everything manually. Also go in and set the memory speed manually. I think the problem is it takes the lowest possible memory setting for the FSB speed you have. I am not sure where in your BIOS the memory speed is located but it was in the same place I set the FSB speed. The memory settings are in the Chipset settings. Mine kept taking the PC4300 as well. In CPU-Z make sure you are looking at the actual reading and not the SPD settings which will not change.
April 30, 2007 8:01:26 PM

I entered all manually, and with a fsb of 333MHz, DRAM Frequency can be only 667, 833, 1000, 1111 and 1333. I choose 667 (PC2-5400) with the timings 4-4-4-12 but it still shows PC2-4300 when booting. And in CPU-Z I read the actual values and not the SPD.
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May 10, 2007 11:33:56 PM

I've read somewhere it could be the bandwidth of the video card that is downsized when I'm overclocking the rest. Can it be possible? Do I have to elevate the PCI Express from 100 to something a little higher?
May 11, 2007 12:10:28 AM

Quote:
I've read somewhere it could be the bandwidth of the video card that is downsized when I'm overclocking the rest. Can it be possible? Do I have to elevate the PCI Express from 100 to something a little higher?


Your exactly right its something you have to just experiment with. I'd suggest checking out the P5B Deluxe thread over on xtremesystems.org under the intel section of the forum.
May 11, 2007 12:11:45 AM

And anyone know where to up the pci express voltage in the P5B Deluxe BIOS?
January 4, 2008 2:21:35 AM

I know this is an old thread... But I'm having the exact same problem right now. When I set my DRAM frequency manually it reads as PC2 4300 instead of 6400. I could be wrong but I could have sworn I didnt have this problem when I first purchased this motherboard. I've owned this board for about a year now and have done some BIOS updates and just noticed a few months ago that it's doing the same thing your system is doing.

Have you found a solution to your problem yet?
January 4, 2008 11:45:20 AM

You shouldn't overclock the PCI-e bus at all. Keep it locked at 100MHz. You are having a weird problem, but it seems like it's just a visual bug. As long as you are in Windows, and CPU-z reports the RAM running at the speed you set it at, I wouldn't worry.

As far as the lower score from 3d Mark goes... that's very weird, but I would imagine it also to be a bug of some kind. When the benchmark is running, do you notice that the frames are actually slower than the lesser overclock? Sometimes it is best to trust your eyes, and not the final score :) 

I know this is an old thread as well, but it needed to be said in case someone read over this and decided to pump their PCI-e bus, which is a no-no.
!