3D-acceleration keeps failing after OC'ing P4D

[erikvanvelzen]

I have some trouble playing games when the computered is OC'ed. After a few minutes DirectDraw-, Direct3D- and AGP-surface-acceleration shut down. This caused the game to crash. I can still enter windows and close down the program. Prime95 reports no errors after an hour of testing.

The processor is an Intel Pentium D 820 OC'ed from 2.8 to 3.75.
Vcore is set to 1.3875V. I don't want to increase it further because 1.40V is the maximum according to the Intel website.
The videocard is a PCIe Abit Radeon x700 pro 128MB. I have reinstalled the latest drivers.
The motherboard is an ASUS P5LD2 based on the intel 945p chipset.

I have locked the PCI-express bus at 100MHz (that is standard right?). PCI-bus is locked at 33.3MHz. Memory is running within specifications.

I know it's a fairly high OC, but do you have any idea what could cause this problem?

 

[Farmer]

First of all: Holy Canada nice OC!

Second of all: I have no clue on the rest of your problems. Run SuperPi 32m. I have no clue on Intel OC. Has it changed?

 

[Sentential]

Leave the PEG frequency alone, in addition you are running with the 24pin ATX and the 4 pin molex to the mobo right?

 

[Farmer]

Hehehe, would the computer start?

 

[erikvanvelzen]

After running prime95 for another half hour during I posted the system stalled. I guess that makes my post obsolete since the problem doesn't happen at 3.7GHz. I'm going to sleep now (im in europe) and leave prime95 running while at a 3.7GHz.

Next week I'll have Asetek watercooling. Could that make a difference in stability or does it simply enable people to choose higher voltages without worrying about heat? (as stated, i won't increase it further since this is my main rig)

I'm still using a $10 heatsink with fan now but it seems to work ok. Throttlewatch doesn't detect thermal throttling

To answer your question: I'm using a 2x10 connector and a 2x2 connector. (checking his motherboard) It doesn't have any other power slots. Should i use a 2x12 connector?

So I have turned PCI Express Graphics frequency back to auto again but it doesn't make any difference regarding the DirectX crashes.

I downloaded Superpi and now Im executing both programs at the same time which puts both cores at a constant 100% load. I couldn't do this without using them together.

edit: ouch i have reached a limit after 10 minutes: thermal thottling is kicking in. every few seconds the processor skips 10-20% of the clockcycles.

 

[Furen]

If I had to guess I'd say the video card is overheating, have you tried checking its temperature?

 

[Pabster]

Yep, Pentium D runs pretty hot. You will definitely see an improvement with decent water cooling, depending on the setup. 3.7 from a 2.8 is nothing to sniff at but it sounds like (on air) you are pushing it just a bit too far.

 

[erikvanvelzen]

40 minutes - thats the time it took before the screen froze during the superpi+prime95 testing. Strangely no errors. All prime95 tests reported completed succesfully.

By the time it froze the CPU was in heavy throttling for some time thougy - I'd say 15% of the clockcycles skipped on average - peaks to 66%. I'll try again next week with a decent cooling solution. This does show a dual-core processor needs 2 tests at a time. During the previous 1 hour of only Prime95 it didn't throttle at all but now it started after 10 minutes.

And about the video card: I have thought about that too. But The directx-problem only occurs at 3.75GHz but it doesn't at lower speeds, so I don't think the video card itself is the problem.

 

[monster64]

It could be your PSU. Not enough power is delivered to your card or your vcore is fluxing due to that really high OC.
http://www.extreme.outervision.com/index.jsp
Check it out, has an OC formula.

EDIT: HOLY $H!T YOUR CPU IS USING ~200 WATTS

 

[exar333]

nice OC!

 

[erikvanvelzen]

Uhm i ended up at an amazing 390W. I think I can toss out this $20 350W OEM PSU.
Oh yeah and add a 25W water pump too

My parents ain't gonna like the power bill thats for sure.

 

[monster64]

Originally posted by: erikvanvelzen
Uhm i ended up at an amazing 390W. I think I can toss out this $20 350W OEM PSU.

My parents ain't gonna like the power bill thats for sure.

LOL, well it looks like the PSU is your problem. Shouldnt've gone with that P-D if you don't like BIG power bills
It won't be that bad aslong as you aren't running a cpu intesive app on both cores 24/7.

 

[erikvanvelzen]

EDIT: HOLY $H!T YOUR CPU IS USING ~200 WATTS

rofl!

Can you recommend me a good 500W PSU available in europe? 500W should allow enough room for upgrading to a highend graphics card, more RAM and another harddisk sometime in the future. We wont need radiators in this house next winter!

 

[international]

sometimes the newest drivers will affect the performance alot....

eg my 5600XT if I used the latest driver, my FPS will be crawling in CS no matter how high I clock, your best bet is to go back to the driver than came with the VGA card.

 

[monster64]

Originally posted by: international
sometimes the newest drivers will affect the performance alot....

eg my 5600XT if I used the latest driver, my FPS will be crawling in CS no matter how high I clock, your best bet is to go back to the driver than came with the VGA card.

His best bet??? Newer driver usually RAISE performance, not the other way around. With your overclock, I would recommend a 500W+ PSU with at least 34A on the 12v rail. Trusted brands are OCZ, Enermax, Antec, Silverstone, PC and Power & Cooling, and Zippy. By available in EU do you mean can ship to EU or has to be from a store already in EU? Also whats your budget?

 

[exar333]

Originally posted by: erikvanvelzen

EDIT: HOLY $H!T YOUR CPU IS USING ~200 WATTS

rofl!

Can you recommend me a good 500W PSU available in europe? 500W should allow enough room for upgrading to a highend graphics card, more RAM and another harddisk sometime in the future. We wont need radiators in this house next winter!

enermax noisetaker 600 watt PSU, get it