Pentium D 820 Overclock w/ The Ninja

rx2 · Post by **rx2** » Mon Jan 16, 2006 2:19 am

Hi,

I have just installed my Ninja on my pentium D 820 and just putting it through some tests and I am just wondering if the results I am getting are good or should I be looking for something better?

I have overclocked the CPU to 3.7Ghz and on idle it runs @ 47, under load something strange happens. The temperature rises to about 62-64 but the speed automatically drops down to 3.5 - 3.6Ghz according to the AI Booster dashboard.

Why is this happening? I am presuming the CPU is getting to hot and so automatically slowing itself down? I am running it on a Asus P5LD2 motherboard.

Reading some articles it suggests I should be getting better performance so I am thinking maybe I need to resit the heatsink again with some new compound?

Any ideas?

Cheers

Robert

rx2 · Post by **rx2** » Mon Jan 16, 2006 2:40 am

OK.. some further interesting results...

For some strange reason the Asus AI-Booster utility reports a different core speed to CPU-Z. CPU-Z reports the correct speed?? mmm... Feeling is there is something a bit weird w/ with the Asus util...

Also I have set the CPU V to 1.4V, however under load it comes down to 1.33V. Can someone tell me what the guidelines are for setting CPU Voltages?

Locklear · Post by **Locklear** » Mon Jan 16, 2006 3:11 am

rx2 wrote:Why is this happening? I am presuming the CPU is getting to hot and so automatically slowing itself down? I am running it on a Asus P5LD2 motherboard.

sounds like thermal throtling to me, which is indeed the CPUs way to defend itself from thermal damage.

rx2 · Post by **rx2** » Mon Jan 16, 2006 12:05 pm

Yeah I thought it was thermal throttling....

However why does the Asus utility report a different speed to CPU-ID? Is there another utility I can use to verify which is correct?

Cheers

Robert

JimX · Post by **JimX** » Mon Jan 16, 2006 1:21 pm

In Prescotts throttling starts at 67c. If it's the same on dual cores then you can find the correct temperature at the throttling point.

rx2 · Post by **rx2** » Mon Jan 16, 2006 2:27 pm

I read somewhere that the 820D throttles at 66c - so what I am seeing is good!

I also have a theory as to why I am seeing differences between CPU-ID and the Asus utility. The Asus utility shows the sum of both cores, whereas CPU-ID is only showing a single core. When the CPU starts to throttle only one core is throttled back hence why the Asus core speed changes - however as the CPU-ID only reports a single core it stays static.

ronrem · Post by **ronrem** » Tue Jan 17, 2006 3:02 am

This is a hot running chip that's been overclocked to,I figure,double as a popcorn maker. You don't say what fan,if any,is on the Ninja,or what sort of case flow you have. It's worth mention that an A64 Sempron runs in the low 30C area,around 90F...so,yeah,65C is pretty toasty. Bigger,faster,louder fans,or less overclock,or trade for an AMD,or consider watercool. Take your pick.

rx2 · Post by **rx2** » Tue Jan 17, 2006 9:08 pm

yeah it's a toasty little bugger the 820D!

I am using a Antec SLK3000B case, and the fan on the Ninja is a Titan 120mm http://www.titan-cd.com/eng/dcfan/fan.p ... =TFD-12025 running @ 12V giving 79.14CFM.

I am going to take the Ninja of tonight, clean, and reapply some heatsink compound just to make sure everything is good there.

Still not sure whether I can expect to get lower temperatures or not with the 820D toaster? Anyone else got a similar setup?

Erssa · Post by **Erssa** » Tue Jan 17, 2006 10:49 pm

Wow I never believed D 820 would be so hot with ninja and a highspeed fan. Although you have overclocked it a bit.

Maybe you should tone down a bit? That Titan fan must be loud as hell. If it is thermally throttling it cannot be a good sign.

ckolivas · Post by **ckolivas** » Wed Jan 18, 2006 8:47 pm

Undervolting the pentium Ds can safely shave off 10 degrees while still being stable in my experience provided your motherboard supports it.

alleycat · Post by **alleycat** » Wed Jan 18, 2006 10:35 pm

There's a great utility called Throttlewatch for checking thermal throttling.

rx2 · Post by **rx2** » Thu Jan 19, 2006 12:12 am

Anyone have any ideas what the lowest voltage a D820 might work at ?

ckolivas · Post by **ckolivas** » Thu Jan 19, 2006 12:15 am

rx2 wrote:Anyone have any ideas what the lowest voltage a D820 might work at ?

Each cpu will be different so there is no answer to that. Try dropping an absurd amount, then halve that till it works and keep halving the difference till it's stable... did that make sense? Anyway running the mprime stress test will usually tell you if the voltage is adequate.

JimX · Post by **JimX** » Thu Jan 19, 2006 12:34 am

My 540 3,2 Prescott is stable at 1,23V and the default voltage is 1.36V. In Intel's site the D820 has min. voltage 1,2V and max. 1,4V. Try 1,25V for starters, run 2xCPUBurn with Throttlewatch on the side, and see what happens.

Pentium D 820 Overclock w/ The Ninja

Pentium D 820 Overclock w/ The Ninja

Re: Pentium D 820 Overclock w/ The Ninja