# Hardware

## General discussion

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### Comparative Speed

By ·
I have been asked to give the speed increase from a Pentium 90 to the new Pentium 4 (2.4GHz), and to justify my remarks. Is there a mathematical way of working out relative speed differences or is it a hit and miss benchmark affair.

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### Comparative Speed

by In reply to Comparative Speed

There are a LOT of variables involved.

Performance differences are VERY dependant on the task being performed.

Raw math tasks will be close to the CPU speed difference.

Tasks that transfer a lot of data on the ISA and PCI busses will not bevery different at all.
(ISA = 4.7MHz PCI = 33MHz)

Programs that take advantage of new commands in the P4 will execute a lot faster on the P4 than they will on the P1. (If they run at all on the P1)

Generally speaking, doubleing CPU speed results in a 15% to 25% increase in performance.

The largest mathmatical difference between the 2 CPUs is in the BUSS speeds.
This is the speed that all the external tasks run at.
With the 533MHz on the P4 versus the 60MHz of the P1 90MHz, you get nearly 9X the data transfer rates to the system buss and memory.

Here is a link for some CPU benchmark comparisons
http://www.cpuscorecard.com/index.htm

Of course, between systems with a P 90 and P4 2.4G there will be a number of other differences that come into play:

HDD data rates: 15MB vs. 133MB
Video data rates: 33MHz (PCI) vs. 120MHz (AGP)

Bottom line, yes you could come up with a formula, but accounting for ALL the variables would be a major task.

Chas

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### Comparative Speed

by In reply to Comparative Speed

A couple more thoughts:

RAM will make a big difference.

W95 can slow down with over 196MB of RAM.
XP is just getting started with 256MB.

W95 will not even load on many P4 motherboards.

Chas

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### Comparative Speed

by In reply to Comparative Speed

Thank you for your valued input. This has answered the question fully. I have tried to explain your facts to my superiors but as always I had to have evidence to back up my findings. Your answer is almost the same as the report I had compiled to get from a second person was of great help. Thanks again

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### Comparative Speed

by In reply to Comparative Speed

Perhaps the more important question is why justify it at all? If your workload is getting by now on such an old CPU and upgrade justification IS necessary, why take the budget hit? How about a smaller step up and save money, such as an Athlon 2000+ system. It will come with a far larger disk and more memory, not to mention a supported OS and should last even longer than the P90 lifecycle at your shop.

You didn't mention if you are replacing hundreds of PC's or just a couple. Or if some new application is driving the upgrade, in which case justification will be self apparent. If only a handful you can probably justify upgrading a few powerusers and retask the displaced PC's to replace the P90-based system.

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### Comparative Speed

by In reply to Comparative Speed

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### Comparative Speed

by In reply to Comparative Speed

You can find a benchmark to prove or disprove almost any point desired. The real test is to setup both machines with the applications used and run a comparison. There will probably be an imense difference. If the performance improvement is percievedto be worth the cost your point is made.

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### Comparative Speed

by In reply to Comparative Speed

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### Comparative Speed

by In reply to Comparative Speed

Intel use a benchmark called the iComp index...older P1 cpu's used to have this marked. Their web-site has a table of relative indexes for their different processors and this will give you a rough guide. However this is only an absolute index of processor performance and doesn't take into consideration the rest of the hardware. A P90 is going to be running at best 60 nanosecond EDO memory, and on some older and more obsolete machines possibly even 70nS Fast Page memory. Newer boards use much better DDR or RAMBUS memory which is a whole different kettle of fish! The bus speed of a P90 is only 60MHz, with a PCI bus speed of 30Mhz. A decent P4 board will have 8x AGP and a FSB of at least 333MHz which is a whole three generations ahead of P90 technology....bottom line - NO COMPARISON!!!

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### Comparative Speed

by In reply to Comparative Speed

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### Comparative Speed

by In reply to Comparative Speed

This question was closed by the author

10 total posts (Page 1 of 1)

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