Upgraded E520 CPU with QX6700 - Best Compatible Heatsink / Fan

Oops... Was meant to say J9761 rather than J9671.

Thanks for response fireberd.

I was thinking my under load CPU temperature was a bit high (100% load when using Handbrake encodes that last in excess of 1.5hrs) and was not planning to get a new case and motherboard for a while.

Do you know if the heatsink I ordered will improve the issue and is the best available?

Cheers

One thing to consider, Dell uses a proprietary CPU cooling fan.  If you use a non-Dell fan you will always get a "fan failure" notice at power on and will have to press F1 to continue with the boot.  It will work OK,  but you will have the issue with the fan failure notice.  

33-40 deg C idle isn't bad.  My Q6600 idles around 30 to 40 C (depends on which temperature monitoring program as they all report differently).  I have a home built system using an Intel motherboard and a very efficient CPU cooler (only thing better would be water cooling) and a "gaming case" with lots of fans.  The CPU fan in my system generally runs around 700 rpm.

Forgot to mention I'm using Core Temp to determine CPU temp.

A few screenshots of CPU temp with various progs. At idle: -

Under 100% load: -

It appears Core Temp has the lowest temps > Speed Fan approx 5 deg C higher than Core Temp > PC Wizard another 11 deg C higher than Speed Fan.

Any ideas which program to have faith in?

I'll install my new heatsink when it arrives and post some new screenshots. In the meantime, I guess I'll keep away from putting the CPU under 100% load. 

Try "speccy".  It seems to be closer to the intel supplied monitoring program than any of the temperature monitoring programs I've tried.

I can't say about the heatsink.

Link to SPECCY

Screenshot of Speccy readings when idle: -

Looks similar to PC Wizard readings. 

What sort of temps should the new CPU be operating at 100% load?

From several sites, doing a google search "Max is 64.5deg according to the Intel spec sheet"

Just changed heatsink; following screenshot under 100%: -

The new heatsink reduces the temp by approx 12 deg C under 100% load. The only issue is that the Speccy reading is still at 71 deg C.

Would upgrading the power supply (fan within PSU) to a Corsair TX650 improve air flow over the Dell stock PSU?

The Dell power supply is not really the issue.  The PC case design was not made for the CPU and heat that it potentially can generate.  Water cooling, if you remove the Dell shrowd/cooler would be my suggestion for best cooler.

Problem is that the heat sink fixings on the dell e520 motherboard are not standard for a third party water cooler to be fixed directly onto the CPU. I guess this is the limitation of the upgrading the e520 and will have to live with the high Speccy readings or upgrade the fan within the dell shroud or upgrade psu.

I have an E510, which is the same BTX style and case.  There wasn't any design room to add fans, etc.  Basically, many Dell's are not made to be upgraded.  A larger power supply with better fan won't really make a difference with the heat.  I have an aftermarket (ATX) power supply in my E510 and it made no difference with the CPU temperatures (I upgraded the CPU in mine from the stock D805 to a D925).