Pentium D 945 Dual core (3.4Ghz) vs Celeron D 3.46Ghz

I just swapped a Pentium D 945 processor (dual core) into my MS7222v3.1 MB with v5.5 Bios update.

I had written an Excel loop to see how much faster the dual core might be, and to my surprise, what the Celeron did in 26.2 minutes, it took the Pentium D 46.3 mnutes to accomplish. Is it just me, or does that seem counter intuititive?

The benchmark for the Celeron was after upgrading the Bios, and the only thing changed was the processor. I also ran some benchmarks on the processor, and it's coming in about equivialent to a Pentium 4 - 1.7Ghz. (Roughly ½ the clock speed of the chip.)

Any ideas what can be done to rectify this apparent problem, or is this chip just a dog?

Any suggestions are appreciated.

I think it's correct. I've put a PDF of the cpu-z screens at http://www.RGPilling.ca/cpudata.pdf if you want to take a look at it. (The MB actually has 2Gb of RAM, but I didn't see any sense in duplicating that screen.)

Thanks,
Robert

The actual chips of RAM that I have in the MB are 1x1Gb and 1x2Gb. Unfortunately, the MB will only handle 1Gb per slot, thus the 2nd one is used as a 1Gb for all intents & purposes. The chips are both PC2-5300. I haven't set anything specifically for the RAM speed, that's just what comes up. (It's all the same as when I was running the Celeron processor, except that it all runs slower now.)

Two things that I would consider aside from those already mentioned:

1. If You just swapped CPU from single core to dual core, You are probably still using uniprocessor HAL instead of multiprocessor which makes You only use on core of Pentium D while other is doing nothing. This would explain why You do not get any improvement but not why Your performance is cut in half. Check task manager if it shows two graphs for CPU or only just one. Also there is a way to change HAL from uniprocessor to multiprocessor without reinstall I would recommend to reinstall Windows when changing from single core to multiple.

2. Pentim D probably needs more power and either PSU or motherboard cannot provide enough juice for it so it is working with errors which are selfdetectable and not critical so it keeps looping doing the same thing until it does it without error.

What Celeron was installed before and is the system faster when you put it back in?

OK look at the comparison below in this link and tell me what you see?

http://ark.intel.com/Compare.aspx?ids=27520,27132,

http://ark.intel.com/Product.aspx?id=27520

http://ark.intel.com/Product.aspx?id=27132

Your FSB ... 800 (200) for the 945 (3.4Ghz) = 17 multiplier

Your FSB ... 533 (133) for the 360 (3.46Ghz) = 26 multiplier

Will your ram run at 800FSB ??

Go into the bios and take a peek?

Right click on My Computer and see what clock speed is showing under WinXP ... or try CPUID (a little utility).

The 945D should smoke the Celery as it has a heap of extra cache, a faster FSB and most importantly two CORES ... not one ... albeit it runs slightly slower.

yes thanks ... missed that so did my own calcs.

3:4 divider but running 266FSB ... comes in at 798 (800) so that's fine.

I can only think that you might have poorly installed the cpu and HSF and it is throttling under load (thermal throttling is common on the Prescott line above 3.2Ghz.

Shutdown, remove the HSF, clean the base of the HSF, reapply thermal grease and likewise clean the top of the CPU and reassemble.

Run a decent application to put the cpu under load and monitor the temps with a utility to see if it is throttling back.


http://www.hardwaresecrets.com/article/104

Hope this helps.

I would also suggest a better benchmark suite to try in the end.

Good luck.