Pentium D 915 not overclocking at all??

dave343

dave343

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I've been running my Pentium D 915 for a few weeks now. I heard these chips are suppose to be good overclockers so I thought I'd give it a shot. Board I'm running is Asus P5VDC-X and yes the overclocking options in the bios are limited unless they've been moved to other places in the bios and I'm just not seeing them. I got the machine to boot at 210fsb (no Vcore adjustments because it doesn't exsist unless I'm looking in the wrong place). Then I tried 220 and it booted fine at 3.07GHz into windows. Played my games fine. At 225fsb the machine does not even post. This board has AGP and PCI-e and currently I'm running an AGP BFG 6800GS 256, and 2x512mb Samsung DDR2 533mhz sticks. The PCI-e even though I'm not using it has a setting of sync or async so I tried both with to no avail. So now I'm wondering if my memory is holding me back. I havn't had a chance to take out one stick and see if it's one particular stick that's holding me back. What do you think? As for the memory options in the bios, maybe I'm looking in the wrong place. Under CPU options it lets me choose Async/Sync for PCI-e, it lets me choose the FSB speed, and thats about it. Any ideas? Surly this CPU must be able to hit past 3.07.
 
If your PCI bus does not lock properly, 220-225 is about as high as you can go before there are problems. You'd probably need a better OCing board if you want to take it higher.
 
acutually i forgot to add that there is one more option in the cpu settings thats lets me choose the pci/agp bus speed and I have it locked at 66/33
 
Can you lock it a little higher? like at 70/35 or something?
 
yeh, I think it gives me the 66/75/83 so I will try that. Will 75 make a difference? Isn't it better if I stay at 66/33?
 
Ok, so now I finally got it overclocked to 3.5GHz!!! Sweet deal from a 2.8. Problem is I when I push the fsb past 250, it boots fine but remains at 3.5GHz. It's like it's ignoring anything above 250fsb.
 
What did you do to get it to boot higher?

Sounds like 250 FSB is the limit on the board. Oh well...still a great OC for a non-OCing board.
 
To get past the 225fsb problem I was having I had to manually set the ram to run at 400 instead of Auto. The other mem speed settings were 266/333/400/533/667/800/1066.

System is 100% stable at 3.5ghz with no v-core adjustment as there isn't any in the bios. Seems like it would go higher if I could get past 250. It's funny that I can set the FSB to 260 and it'll post but stick to 250 and nothing changes, remains at 3.5 like after 250 has no effect.
 
dave343 said:
Ok, so now I finally got it overclocked to 3.5GHz!!! Sweet deal from a 2.8. Problem is I when I push the fsb past 250, it boots fine but remains at 3.5GHz. It's like it's ignoring anything above 250fsb.
Click to expand...

Heh I got 3.64 out of mine so far, on a Asus P5P800-SE. My ram starts erroring pretty bad, and I get a fairly bad voltage drop on my core after that. So stable at 3.64 on my 915, going to new mobo with DDR2 1000, and a new heatsink/fan. I'm going to push for at least 4ghz.

At 3.64 I run idle around 26c, and full load I top out around 48c.
 
What kind of OC's can you get on the 65nm 915 on stock voltage (since some of those budget boards don't have any voltage options)? Just wondering because it seems like the 805 I have does about 3.4Ghz or so before a voltage bump is needed.
 
kirbyrj said:
What kind of OC's can you get on the 65nm 915 on stock voltage (since some of those budget boards don't have any voltage options)? Just wondering because it seems like the 805 I have does about 3.4Ghz or so before a voltage bump is needed.
Click to expand...

I am running at 3.64 at stock voltage, infact I'm a little below it, it runs around 1.1-1.2 volts.... And it should run just around 1.3... But thats a common problem so I read with my mainboard Asus P5P800.... I guess there is a mod I can do to it to fix that issue, but I probably wont in favor of a completely new mainboard. I am willing to bet with 1.3 volt you can clock to 3.8-4ghz flat on the 915 with overclocking ram, currently I'm running PQI Turbo DD400, I may buy some DDR500 just to see, being thats the part of my machine that fails first. If I get the new mobo first it will have DDR2 1000+ and that wont have an issue, probably going to buy Corsair XMS.

The 900 series dual cores are insane for overclocking ability, and from what I have read elseware the 915/920s are the best for it. I guess you get around the same numbers from the 930+, and just spend more money on the proc...
 
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