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N4000/RP7400

 
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Nobody's Hero
Valued Contributor

N4000/RP7400

We have many N4000's. However, I purchased a second hand server. Looks like a different class N. It is a C chasis, rp7400. I know the difference is that I can use the 750 or 875 CPU's. Question, is the bus speed of an rp7400, faster that an N4000? Or did they just change the name?
UNIX IS GOOD
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Robert-Jan Goossens
Honored Contributor
Kent Ostby
Honored Contributor

Re: N4000/RP7400

Robert -- They gone through and standardized the names over the past couple of years and this was one of the changes.

Best regards,

Kent M. Ostby
"Well, actually, she is a rocket scientist" -- Steve Martin in "Roxanne"
Robert-Jan Goossens
Honored Contributor
Solution

Re: N4000/RP7400

Ted Buis
Honored Contributor

Re: N4000/RP7400

There were also some changes to the system board, so the name changed and the part number then ended in a C, while the N-class had part number ended in A orginally (360 and440MHz) and then B with the (550MHz) support. The internal memory and I/O speeds are the basically the same. The turbo-runway bus coming out of the processor chip was basically the same for the pa-8500, pa-8600, pa-8700 and pa8700+ processors. The pa-8800 uses the Itanium 2 bus which is 3X faster, but the N-class, rp7400 compensated by using having a memory contoller that could support more bandwidth to memory and two processor-I/O buses, each with 2X the turbo-runway bus capacity. However, to get this maximum bandwith memory had to be in all four memory carriers. So for maximum N-class performance make sure all memory carriers are configured and populated. The new rp7420-16 has two cells each with two Itanium 2 buses for two pa-8800, so each cell (up to 8 CPU cores per cell) has significantly more processor and memory bandwidth than the N-class. The greater bandwidth needs are one of the reasons why a redesign of the N-class (rp7400) was needed to go to the cell based technology that is used in the pa-8800 based Superdome, rp7420-16, and rp8620-32.
Mom 6