Processor comparisons

[Andrew Moody_1]

Hi

I have a mixture of servers using various processor combinations

PA-8700 750Mhz & 875Mhz
PA-8800 800Mhz
PA-8900 1Ghz

I'm looking for a definitive processor roadmap and benchmarking so I can compare performance between PA-8700's and PA-8900's for example.

Regards

Andrew

[Andrew Rutter]

hi, not exactly what your after but have a look at this. it does have some detailed info on the differences.

http://h71028.www7.hp.com/ERC/downloads/5982-4172EN.pdf

Andy

[Andrew Moody_1]

Thanks

It seems this is in part some of the information I was after

"Thus, each PA-8900 core will deliver more performance than the PA-8700+ processor"

But if anyone has access to more specific performance comparisons I'd be interested to read them.

With thanks

Andrew

[Patrice Le Guyader]

Hello,

It depends of the type of server but here are some value :

PA-8700 750Mhz ==> rp5430-2 PA-8700 750 1p 14200 Tpm
PA-8700 875Mhz ==> rp5430-2 PA-8700 875 1p 15506 Tpm
PA-8800 800Mhz ==> rp7420-16 PA-8800 1000 2p/1c 47600 Tpm (23800/cpu)
PA-8900 1Ghz ==> rp7420-16 PA-8900 1100 2p/1c 52900 Tpm (26450/cpu)

Regards
Patrice

[Joshua Scott]

The PA-8700 CPU is an 750 or 875MHz CPU that has 2.25MB of L1 cache.

The PA-8800 CPU is 2x 800MHz PA-8700 CPUs on one chip that each have a 1.5MB L1 cache & share a 32MB L2 cache

the PA8900 CPU is 2x 1000MHz PA-8700 CPUs on one chip that each have a 1.5MB L1 Cache & share a 64MB L2 Cache.

So they're all the same technology, but they have ramped up the speed & cache as they go along.

The PA-8900 1.1GHZ is likely to be the last PA-RISC chip that HP makes.

Josh

[TwoProc]

Hmmm,

Our PA-8800's are 1Ghz...

[Joshua Scott]

John,

Yes, the PA-8800 came in 800, 900, and 1000MHz speeds. I was specifically referring to the CPUs that Andrew has mentioned.

the PA8700 comes in 650, 700, 750, 800, and 875 MHz speeds as well

The PA8900 also comes in 900, 1000, and 1100MHz speeds.

Josh

[Alzhy]

Prior to Mar. 2004, all of our machines *rp and SD)were PA8700 based (875Mhz) - they were since upgraded to PA8800 1Ghz. The speed differences are really not that great -- between 10-15 per cent on our mostly DB environments. What these new PA8800 and PA8900 CPUs give us is greater density -- so for the same footprint - you can have 1.5x to 1.7x more computing power.

Take note though that having daul cores in a CPU is not the same as having 2 seprate CPU sockets. That is why Oracle licensing has reently relaxed their policy and treats cores as .25 to .75 of a single core CPU.

So as far as raw CPU horsepower:

2 x 1Ghz sinngle core CPUs will be more powerful than a single CPU with 2 x 1 Ghz cores.

[Nico Schockaert]

The performance depends not only on the type of processors (speed, cache size, chip-set,...), but also on the type of applications. That's why you can find different official numbers on e.g. spec.org (specint, specfp, specjbb, specweb99, ...) On tpc.org you can find numbers like tpc-c, tpc-h, .... You have also e.g. the Sap numbers.
So, first of all you need to know what kind of application you run before talking/comparing performance numbers. And the best is always to do a benchmark itself.
Hope this helps,
Nico