E8400 FSB speed > 500???

theLaminator

Distinguished
Jul 21, 2008
127
0
18,680
So here's the deal I have an E8400 on an Asus R.O.G. Rampage Formula using G.Skill PC2-8500 (1066) PI series memory. I've been able to overclock it easily to 4.0ghz with a FSB speed of 500 and multiplier at 8 I set the Nbridge strap to 333, and my memory speed is now at ~1000mhz. I'd really like to hit a 533 FSB however I can't get over 500. I read a post at xstreamsystems.org http://www.xtremesystems.org/forums/showthread.php?t=194404&highlight=rampage+formula where a guy is getting up to 600 on his FSB what could be the problem here? I know its not my cpu voltage because i've changed that, I think it might be my ram timings or maybe NB voltage your comments would be greatly appreciated.
 

closed_deal

Distinguished
Oct 30, 2007
675
0
18,980
It'll be NB voltage followed by RAM voltage as a maybe. Reading the link you gave the user had his vNB at 1.57... I have the P5E the basic version of yours and need 1.65 vNB just to get slightly over 520FSB.

You may then need to think about extra NB cooling or adding it to an existing water loop.
 

theLaminator

Distinguished
Jul 21, 2008
127
0
18,680
Hmmm ok I'll try raising the NB voltage a bit tonight, I'm going to look around to see if I can find a safe peak NB voltage for my board. My ram is at 2.04v, recommended by G.Skill so I doubt its that but I guess it could be a possiblility.
 

closed_deal

Distinguished
Oct 30, 2007
675
0
18,980
1.70 volts on the NB is when my bios tells me i need extra cooling so i'd say the same for you. However if you go into your BIOS and manually increment the volts up it 'should' have a traffic like system in place where red is get some extra cooling.
 

closed_deal

Distinguished
Oct 30, 2007
675
0
18,980
Best to leave cpu pll voltage alone it you can, as for FSB termination only increase when you get unstable overclocks getting the high FSB's. TBH you shouldn't need to adjust either for 533 FSB just NB.
 

PCnut

Distinguished
Mar 12, 2007
139
0
18,680
I did some looking bro and dont know about voltages but according to the Data sheet on the X38/48 the highest temps should be 92 C. so just watch this on one of the temperture monitoring programs you have....
 

theLaminator

Distinguished
Jul 21, 2008
127
0
18,680
Well I got the fsb up to 533 which matches my ram's speed thanks to closed_deal but it seems my 3dmark06 score dropped a decent amount. Think this has something to do with the lower multipler? I'm at 4.0Ghz like I was originally though.
 

closed_deal

Distinguished
Oct 30, 2007
675
0
18,980
Did your RAM timings change from C4 to C5? My 3Dmark results are better when i'm at 445FSB with RAM timings at 5-4-4-12 than FSB 500 RAM timings at 5-5-5-15, might be worth another tinker to find out ;).
 

theLaminator

Distinguished
Jul 21, 2008
127
0
18,680
I'll check that out, I'm relatively new to overclocking and don't know a whole lot about the ram timings :) . I talked to my brother yesterday and his 3DMark06 score has dropped too, and he hasn't changed any of his settings yet. I wonder if its not an update to the program to include the new hardware and instead of letting our scores remain the same and the new hardware owners scores going higher; just nerfing the whole system...who knows
 

TRENDING THREADS