Pentium D 805 OC Results

I've just fully rebuilt the system over the weekend, including stripping off every heatsink on the board and applying AS5. I've relaid the BigT with AS5 again, tested on the bench, I was right in thinking that the bracket underneath the board get hots :/

I've modded the case as well to improve the air flow from intake to exhaust. I'm even tempted to get a duct for the BigT from the side window - it does have an 80mm fan in it already ... hrmm.

Anyways, after extensive cable tidying I've also managed to squeeze another 120mm fan into the case to help direct air flow over the CPU/Northbridge and VR Heatsink as well.

I've not had chance to test this yet, probably another 2 days or so, but I'll keep the thread updated.

I did manage to switch it on this morning to check some BIOS settings, and the CPU Idle temp in BIOS was hovering around the 45C mark. I'm hoping after the AS5 settles down across the board I'll see a marked improvement in temperatures.
 
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I purchased a Pentium D 805 2.6ghz and I achieved the following results:

(my rig)
Asus P5WDG2-WS
Zalman CNPS9500-AT
Pentium D 805 2.6ghz (standard voltage: 1.2625v)
Sapphire X1800XT

(friends rig)
Asus P5WDG2-WS
Zalman CNPS9500-AT
Pentium D 805 2.6ghz (standard voltage: 1.3250v)
Powercolor X1800 GTO

Straight up to 3.8ghz without even needing to up the voltages. Using Rightmark proggy to watch for throttle (throttlewatch didn't seem to log with TM2). Ran several torture tests and didn't notice any throttling at all. Heat: Idle 46c - Load 64c

At 4.01ghz (voltages upped to 1.45v) I started to get mild throttling, temperatures: Idle 50c - Load 70c+.

My friend has EXACTLY the same rig (apart from he has an X1800 GTO, I have an X1800XT) and he also achieves 4.01ghz with NO THROTTLING, but his voltage is set to 1.5125v. His temperatures never exceed 63c.

What I dont understand is why am I getting higher temperatures than him even though my voltages are much lower? Could it be the graphics card is raising the ambient temperature in the case or maybe even a bad application of heat conductive compound on the cooler block?

I'm going to order some compound remover and some Artic Silver 5 to see if that helps, should I also lap the surface of the chip and cooler block with some moist paper or something?
 
Hrmm, I'm tempted to see a pattern here - Asus Motherboards and Low Voltage PenD 805's....

My stock voltage is reported as being 1.275 in Rightmark.... and my chip hits high temps at just 1.425 volts.....

I've scaled off for the time being, as noted above. I've got some load testing to do once I have everything back up and running now that my rig is rebuilt.
 
Arthalen said:
Hrmm, I'm tempted to see a pattern here - Asus Motherboards and Low Voltage PenD 805's....

My stock voltage is reported as being 1.275 in Rightmark.... and my chip hits high temps at just 1.425 volts.....

I've scaled off for the time being, as noted above. I've got some load testing to do once I have everything back up and running now that my rig is rebuilt.
Click to expand...

The fly in the ointment is my friends chip running at 1.5125v and never exceeding 63c at 4.01ghz at full load!!!

For the record I pumped mine up to 4.1Ghz (205fsb) just to see if I could make it boot and I managed to get into windows and run some torture tests. I got lots of throttling :/ (voltages had to be upped to 1.5v). I got scared at that point and put it back to 4.01ghz.
 
For the record, I managed to POST my machine at 4Ghz, but couldn't boot into Windows. At the time, I had my voltage set to low really - 1.35 I think it was. I know the chip can do 4Ghz, just about getting the temperature under control.

I definitly think (as with all overclocks) the quality of the chip is affecting the temperatures on these things, the lower the starting the Vcore, the quicker the temperatures are ramping up for people clocking these.
 
Does any one really think it's worth getting new RAM / Mobo and buying one of these chips for £80 and getting rid of my current rig (see below)?

Will games run any better? or processing power be greater? (Significantly)

Cheers guys
 
Skinner.Daddy said:
Does any one really think it's worth getting new RAM / Mobo and buying one of these chips for £80 and getting rid of my current rig (see below)?

Will games run any better? or processing power be greater? (Significantly)

Cheers guys
Click to expand...

Not for games - You'll be able to OC the chip to reach a similar performance level that you already have, but the only gain you'll see is with the Dualcore. So unless you use a lot of apps in Windows not at the moment tbh.
 
Ive only just set mine up and I wont be overclocking at this hour but its a budget Asrock twins motherboard using my old ddr500 ram. Does 1m superpi in 64 seconds at stock and it'll do the same time while running prime as well, temperature appears to be 45c at the time.

I think that superpi is a bit slow, might be my bios settings or single channel or a limitation of using ddr1 maybe. Still in windows I like this multitasking and its definetly no slower then my last system which was 37seconds in superpi.

Feels nippy I think because it never gets caught doing anything, always another processor waiting to do something else :)


Edit:

Did everyone elses product code end in "SL8ZH" (Its the bar code label on the packaging box)
 
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Cpu-z isnt reporting it correctly so Iam not sure, it says 2.5 but I think its more like half that. Rightmark is reporting 1.350 now I look.

Check out my overclock :cool:

8056bx.jpg
 
Good point. Thanks, works now apart from not showing the memory tab.

Just realised I cant set the memory timings correctly in this bios, they should be 3-5-5-10 and the max it lets me set it to is 3-4-3-8 which causes a problem if I ever need that 250mhz.
Also has settings for
MA timing
Write to Write Turn around
Read to Write turn around
Write to Read turn around
:confused:

I put it into compatibility mode and maybe that will allow some clocking tommorow. Iam at 2787 now anyway.


Edit:
Mobo can be hardmodded to adjust vcore apparently, a bit beyond me though
http://www.xtremesystems.org/forums/showthread.php?t=95250
 
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I have the same stepping on my Core too, SL8ZH.

To find out the base voltage of your CPU, use Rightmark CPU utility.

Also, that SuperPi is very slow - mine is down to 34 seconds at present! :D
I would suggest you concentrate on raising the FSB and run the memory on a divider for now, before trying to raise the memory speed and tightening the timings.

1 step at a time, lol :p
 
I figured the same thing and I've got the speed upto 3.18 ghz now but the superpi time is exactly the same, still terrible at 66 seconds. I guess the memory is really slowing it down.
Iam having trouble getting this thing to go any higher so it looks like this board is no good for this project without doing some soldering for a vcore mod

Also I found out the Asrock twins is not conroe compatible, thats the next revision which is not out till June
 
Fulcrum said:
I figured the same thing and I've got the speed upto 3.18 ghz now but the superpi time is exactly the same, still terrible at 66 seconds. I guess the memory is really slowing it down.
Iam having trouble getting this thing to go any higher so it looks like this board is no good for this project without doing some soldering for a vcore mod

Also I found out the Asrock twins is not conroe compatible, thats the next revision which is not out till June
Click to expand...


Dont see why the ram should be the problem, I am running really crappy DDR2 @ 1:1 with terrible timings and I have managed 34s on super pi. was around 42-44 at 3ghz
 
Im stuggling to get 4.0 atm :/
got it on full volts :eek:
on wc so temps are nice and low (35 idle 55 load)(asus probe)

just wondering what bios's ppl are using, i havnt looked into it yet so dont even know whats available.

CMON 4.1 :E
 
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