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Overclocking Intel Pentium D 805 2.66 to 3.8

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January 31, 2009 12:40:10 AM

Hey guys, im new to overclocking and this forum, I read a few guides about overclocking CPU's and I read a few reviews about the 805 and read that you can overclock to 190 FSB and still keep it stable, or even higher, but I'm completely fine with a CPU Clock of 3.8 GHz. I want to bring up the CPU Clock because I do not have the money to spend on a new CPU and Motherboard and I wanted to bring up my CPU Performance to decent levels because I do not think the frame rates on games I play are not at the optimal level with a old CPU but a new Graphic card.

Computer Specs:

- Intel Tappen D945GTP
- Intel Pentium D 805 2.66 GHz
- Kingston 1GB DDR2 533MHz
- Western Digital WD2500JS-22NCB1
- ASUS ATI Radeon HD 4670 512MB DDR3
- 350W Generic Power Supply

Is there anyway to raise the CPU Clock above 3.0 GHz and keep my system stable without having to add extra cooling or upgrade any parts? Awaiting your response :bounce:  , thanks in advance :D 
January 31, 2009 5:02:26 AM

well your right about needing a boost in the cpu performance area. Umm Have you gone into the bios and seen if you can manually set the cpu voltage and fsb. I ran a quick search but didn't come up with anything. My guess is that you can't do too much with that motherboard. Also without additional cooling you aren't going to get very far ocing a pentium d without running into temperature issues.
If you can't adjust anything I would start saving and slowly replace your system. First the mobo then the ram then the cpu and cpu cooler etc. If you can adjust the settings start slowly bumping it up until you hit 60-70 C (depending on your comfort level) after running prime95 for 10-20 minutes or so. I am imagining you'll hit a thermal threshold quickly as my pentium d 920 ran quite hot.
a b à CPUs
January 31, 2009 5:46:06 AM

I have the ASUS 945G and Pentium D 805 for years. Relagted to an office workstation now. 3.8GHz. on air is attainable with a 955/965/975 chipset, but the 945G is left with a lot to be desired when compared to these chipsets. Only revison 2 945G boards with better equipped voltage regulators to support 65nm C2D would give the same performance as the previously mentioned Intel chipsets of the era with an 805 D dealing the hand. Besides, at 3.8GHz, a 1.2GHz. overclock, you are going to run into a serious heat problem unless you have watercooling. The 805 D performs very well at 3.5-3.6GHz. which is what you should expect with the 945G. That's what I get maxing out my MB's capabilities including BIOS, applied voltages, FSB and the 'heat' situation.

This article brings back memories. Several guys on this forum reached 3.8-4GHz. on air with the 955 chipset I believe. That's with extreme voltages and excellent cooling. With the 945G I found the only way to get much above 3-3.2GHz was to raise the PCIE frequency to 115-118. This has been discussed at length by me on this forumn over the years. I have a couple of 965 boards running, but have never installed the 805-D and tried it out. The 805-D is very weak, especially at today's standards, running default at 133MHz. FSB and processing data at 2.66. That's where I have it set now in a lowly Intel ATI Radeon Express 200 chipset. I'm glad I don't use often anymore. But it does multitask fairly well. Put it in the ASUS 945G and crank the FSB to 175MHz. or so and it becomes really perky. 8)

http://www.tomshardware.com/reviews/dual-41-ghz-cores,1...
January 31, 2009 11:51:12 AM

Thanks for the advice, I think i'll keep it safe and see if I can get a new motherboard in a few months or so. I've gone through the BIOS and I found the the CPU Multiplier is locked so I would be forced to raise the FSB. Ill try and bring it up 10-15 MHz and keep it there for now, if I find the performance is still not enough ill set it back to 2.66 and save up some money for a good cooling system or a new CPU itself.

I will consider the ASUS P5L-MX 945G once I earn the money for it, Form Factor fits perfectly with my case and has enough PCI-E slots, and if I want to upgrade my CPU later I wont have to buy a new motherboard

Thank you for your expertise :D 
!