6:07 AM - 05/10/2006 by
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Our overclocking project with the Pentium D 805 starts with a front side bus speed of 133 MHz (533 QDR).
FSB clock speed settings may be applied through the BIOS software. Here's an example from an Asus motherboard.
Using programs from the motherboard vendor, or other tools, you can even change the FSB clock rate while Windows is running. Here's an example of Gigabyte's EasyTune 5 program at work on this task.
The following table provides an overview of some of the mathematically possible CPU clock rates that result from raising the FSB clock rate.
| Pentium D 805 with 20x Multiplier | |
|---|---|
| FSB clock | CPU clock |
| 133 MHz (Default rate) | 2.66 GHz |
| 140 MHz | 2.80 GHz |
| 150 MHz | 3.00 GHz |
| 160 MHz | 3.20 GHz |
| 166 MHz | 3.33 GHz |
| 170 MHz | 3.40 GHz |
| 180 MHz | 3.60 GHz |
| 190 MHz | 3.80 GHz |
| 200 MHz | 4.00 GHz |
| 205 MHz | 4.10 GHz |
| 210 MHz (THG clock) | 4.20 GHz |
| 215 MHz (Maximum boot clock) | 4.30 GHz |
At first blush, overclocking such a small and cheap CPU to 4.1 GHz seems impossible. Nevertheless, the numbers don't lie, and if you consider the ancestry of this CPU more carefully, this kind of overclocking becomes easier to understand.
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I am quite interested in your post regarding the D 805. Considering that it is now available for around $60.00 (03/20/09), it still sounds like a steal. We just upgraded our Adobe CS2 software to the new CS4 Master Suite, which caused the need for a graphics card upgrade. We have an nVidia GeForce GTX 260, but haven't installed it because our computer is a HP Media Center PCm7350n computers each with a 2.8 GHz CPU on a ASUS P5LP-LE mobo. Your article seemed to imply that there is software available that might adjust the clock from inside windows and we are wondering if it can on that mobo or if we will have to get a different mobo. If so, we are wondering what might be our most cost effective but stable options. We are certainly going to need a new power supply for the GTX 260, which requires 525 Watts. We are looking at just putting in PC Power & Cooling’s, Silencer 610 EPS12V power supplyand letting it go at that, but we are also thinking about upgrading the CPU and mobo if necessary.
Of course, we would like to keep the cost down as much as possible.
We have no idea where the best bang for the buck will be. For us a stable system is more important than blazing speed. Thus, the HP's worked fine for what we originally got them for; it’s just that our graphics and video production software are forcing upgrades in speed and power.
The D850 chip sounds incredible and the power supply we already have to get will handle overclocking that chip. It even sounds like that chip will work in the existing mobo if we can find a way to change the clock speed from inside windows instead of from the BIOS. HP BIOS does not allow adjusting the clock speed in the BIOS but can't BIOS just be changed as well; isn't it just an EPROM?
Anyway, even if we opt for changing out the mobo for another case compatible Asus mobo, we still have to answer the question of which board and chip combination will give us the most stable service for the least cost.
Any ideas that might help us plan the most appropriate upgrade and the least cost?
Any ideas that might help us plan the most appropriate upgrade and the least cost?
With the price of components that you need to make this run stable, and the amount of electricity that this would use, a cheap Core 2 and motherboard and DDR2 memory would cost you less in the long run.
Example:
Intel Pentium Dual Core E5200
Kingston DDR2 2x2GB 800MHz
Gigabyte G31M-ES2C
This should cost less than $200.