ASUS P5K SE memory PC2-8500 problems


Nov 30, 2007
hi, i'm new here (and in "advanced PC config ") to take it easy with me

anyway, i'll cut to the chase. i bought myself a new PC (config made in a rush, i made some mistakes but that's history already) and i'll highlight these : E6750, Asus P5k SE. 2x1 gb Kingston Hyperx dual channel PC2-8500.

i've been through hell to get the memory run at 1066 Mhz(bios shows 1067). for 3 days, when i got home from work i googled asus p5k series+1066 memory and i tried almost anything. i set the memory on 1067, manuam timings 5-5-5-15, voltage 2,2 V. nothing works. i managed to make it work @ 1000 mhz but i eventually get a blue screen and forced reboot or just jams.
each time i choose 1067 frequency it would say "overclocking failed" just after it boots and when i chose 1150 it loaded bios and then it stayed it blocked in a back screen.

there are some things i haven't tried. some forums say that you have to lower CPU FSB to 266 in order to make the ram work at 1066 (on asus p5k series or in general, i don't know that) and another fellow that has the same mobo said that it eventually worked for him after he changed the ram from the yellow slots to the black slots. now, i'd rather not do that since i plan on getting another 2 gb of ram.

the 2nd part of my question would be ( if i eventually manage to make it run at 1066 with your help) if i should lower CPU frequency to match the ram frequency or leave it as it is. i'm interested in performace in games, nothing else.

the 3rd option would be to return the pc2-8500 memory and get 4 gigs of pc2-6400 but i'm trying to leave this as a last resort option.

thanks alot and sorry for my poor english :)


Feb 8, 2002
I run my pc8500 @ 1000 ,mhz, sedt the fsb to 500 and the mulitplier to 7.
I run over clocked to 3.51 on the chip but a 1:1 ratio with the fsb and memory and no troubles at all.
Also I have tried this everywhich way, but use default settings for the memory otherwise, liek ras to cas and all that, and you shoudl be ok.
I also ran it at 1066 but then my ratio was off and after extensive testing I find that running the 1067 at 1000 with default settings is actualy faster and more stable than 1067, try it.

My specs

Asus p5k
Intel duo core 2 extreme x6800 @ 3.51
crucial ballistix pc8500 4x1 gig @ 1000 mhz
Evga 8800gtx superclocked 621/2000
X-Fi extreme gamers card
7800 inspire 7.1 speaker system
Antec trio 650 psu
Plextar 16x dual layer dvd/rw
seagate 400 gig sata 7200.10
Zalman 9700 cpu cooler
Thermaltake Armor 8000bws full tower
dual boot Win xp pro/ Win Vista ultimate 64 11936 3dmark 06


Sep 3, 2007
I got the exact same board, and if you pay attention in the manual there is a little *where it says you can run 1066 ram. Cant find mine atm but I know you got to set it a certain way, because i read it im my manual.

I run 2 gigs of pc6400 Adata that cost me $49.00 for both. I have a e2180 CPU running at 3.3 GHZ. I love this machine.


Oct 8, 2007

If you have your timings set to 5-5-5-15 and voltage to 2.2volts then you may need to raise your northbridge voltage a little if it is set on auto move it to the next setting and if that does not work go to the next. I am running 1066 on a P5K-Deluxe and my settings are 5-5-5-15 2.2v with NB at 1.4v and it runs great.


Feb 8, 2002
I found running 1066 was not a problem, actualy I ran it much higher than that, but like I said if you mess with the latency settings a all or the parmeters of the modules I found them to be unstable at any frequency.

I was getting bsods in vista constantly but not in xp, I eventualy went to default settings on the latency but left my memory at 1067, 1000, 800 etc.. and no more bsods.

I believe the board manual also says you can run 1333 fsb, I dont think the board is the limitig factor.
Try raising the fsb frequency and the multiplier together to keep within overall spec on the chip or as in my case slightly over.

I bought the 8500 @ 1066 specificaly to be able to over clock the fsb with out memory limitations and it has proven for me anyway to be the fastest performance settings, even though I run the 1066 at 1000 it is still faster and I am not taxing my memory having to add power to it or heating it up as much.

I think if you default your timings and then move the frequency to 1066 which is going to be 533 btw and you adjust your multiplier accordingly, for example, mine is 7 x 500 = 3500 or 3.51 ghz it will run it, but as soon you start with the timings you may see problems.
my 2.93 runs 3.51 with no extra volts, no het issues and has never locked or acted up.

Anyway I ran my settings in every which way and extensivley benchmarked with mem test and 3dmark to verify the changes and I found better performance, more stability and overall my highst scores and fps in games like crysis, by running a 1:1 ratio with the mem and the fsb, and by leaving the mem settings at default.
otherwise at 533 x 6 the overclockign was nearly identical, but the system wasnt as fast as the ratio was off, 3.49 ghz on the chip but 5% or more dip in gaming performance which is what led me to running so may tests.

I had them tweaked for speed for months but never saw any performance advantage, even with extra voltage, the only thing I noticed were bsods in vista, after testing with default timings, I scored better, and havent had a singel issue until the no post issue I just had, but found a work around for.