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Pastimes : Dream Machine ( Build your own PC ) -- Ignore unavailable to you. Want to Upgrade?

To: SnowShredder who wrote (10952)6/4/2000 11:03:00 PM
From: Nick Morvay  Respond to of 14778
 
A difficult task, but bear with me:

The performance difference depends on which die (CPU silicon chip) you are referring to. The new Pentium III Coppermine core comes with 256Kbytes internal (on-die) full CPU clock speed cache. The older Pentium III Katmai core comes with 512Kbytes of external half speed cache. The Pentium IIIE is a Coppermine chip while a Pentium III is a Katmai chip. Furthermore, there are different Front Side Bus (FSB) speeds. A Pentium IIIB uses a 133Mhz FSB while the Pentium III uses a 100Mhz FSB. So a Coppermine with a 133Mhz FSB is a Pentium IIIEB. All Pentium III processors that are faster than 600Mhz are automatically using the Coppermine cores and Intel does not add the E to them. What's it all mean? For the same CPU clock speed (Mhz) the faster FSB will access memory faster translating into faster application run times. The full speed cache will also run applications faster.

The Xeon can come with upto 2Mbyte of internal cache and runs at full speed. There are a lot of other features on this chip that was brought over from the Pentium Pro CPU. These are used for servers and high end workstations. The big advantage with the Xeon is the large cache which will complete a memory intensive application much faster. For the same speed a Xeon is usually much faster. Remember that CPU clock speed (Mhz) alone is not the only determining factor in how fast an application will run.

Here is a link for CPU performance/cost numbers that may help: cpuscorecard.com



To: SnowShredder who wrote (10952)6/4/2000 11:32:00 PM
From: Nick Morvay  Read Replies (2) | Respond to of 14778
 
It's not clear if you are buying a new system or replacing a CPU. If you are thinking of replacing the P3 with the Xeon they are not socket compatible. The Xeon takes a Slot 2 mounting while the P3 is a Slot 1.

As a side note, the cartridge CPU mountings are being dropped by Intel for the cheaper Socket 7 mountings. This is the same socket as the older Pentium and Pentium II were using.


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