Best CPU for Asus P4B533?

Posted on 2004-08-16
Medium Priority
Last Modified: 2008-01-09
In a machine I built myself, I have an Asus P4B533 motherboard. It has a 478-pin CPU socket and an Intel 845E chipset.

Specs: http://usa.asus.com/prog/spec.asp?m=P4B533&langs=09
Manual: http://www.asus.com/pub/ASUS/mb/sock478/p4b533/e1148_p4b533.zip

Chipset info: http://www.intel.com/design/chipsets/845E/

- What is the fastest non-HT CPU I can put in this motherboard?
- What is the fastest HT CPU I can put in this motherboard?
- Where should I look for overclocking resources?
- Opine: Would you recommend HT at all, and in this system in particular? (I know the PC2100 memory and disk can be bottlenecks.)

I have researched the issues, but want confirmation from experts who follow CPU issues.
Question by:ChrisSchumann
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LVL 69

Accepted Solution

Callandor earned 500 total points
ID: 11811480
I actually have the P4B533-E running with a P4 1.6a overclocked to 2.4, using a stock heatsink/fan.  With a 533FSB (actually 133 on the board), you can run the P4 3.066GHz HT, or the P4 2.8b non-HT.  I use PC2700, so that is not a real limitation.  I also have an Abit IC7-G with 800FSB, and that has a 2.8c running at 3.15 - I think the 800FSB is a better candidate for HT.  As you go higher in speed, it becomes more difficult to get tremendous overclocking, like the 50% I got.

For resources, check

Author Comment

ID: 11811706
The specsheet says the P4B533 can use PC1600 (DDR200) or PC2100 (DDR266) memory. When you overclock, does that just effect the CPU or does it effect the PCI and memory buses (necessitating PC2700)? Or does the memory continue to run at PC2100 speeds?

To overclock, do you increase the frequency multiplier? FSB? Did you have to tweak other BIOS settings such as CPU voltage, wait states, etc.?
LVL 69

Expert Comment

ID: 11811924
I think PC2700 wasn't available when they rolled out the board, and there's no technical reason why you can't go with faster RAM (my Abit has PC4000 RAM in it).

Ideally, when you overclock, you want to keep the AGP bus at 66 and the PCI bus at 33, regardless of whatever the rest of the system is doing.  Asus and Abit generally provide that control in their BIOS, which makes them suitable for overclocking.  I run the P4 1.6a with an FSB of 150, but it is spec'ed for 100.  The RAM will try to run at whatever speed you set the FSB to: for 100FSB, this is 100 x 4 (quad-pumped) x 4 (32 bits) = PC1600, for 133FSB, this is 133 x 16 = PC2100, for 150FSB, this is 150 x 16 = PC2400, for 166FSB, this is 166 x 16 = PC2700, and for 200FSB, this is 200 x 16 = PC3200.  Hopefully, you see why I had to go with PC2700 memory.

You can't change multipliers on cpus these days, except for certain mobile AMDs, so you have to change the FSB.  The problem with changing the FSB is that the AGP and PCI buses are usually tied to it as an integer multiple, but that's where the AGP and PCI lock feature comes in.  I did not have to change anything in either of my setups except for the FSB.

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