Thanks guys. Any idea how the CPUs used to populate the Xserve dual 1.3 GHz differ (or are the same) as the ones in the dual (and single) 1.25 GHz MDD?
I doubt it's worth the trouble to upgrade a dual 1.25 GHz MDD, but I might put a dual module in the single 1.25 GHz MDD I've got here.
But there are all those variations in on-chip cache and on-CPU module cache, and then the question of whether the 1.3 GHz chips might be more overclockable than the 1.25 GHz, or perhaps were built on the same die and so are essentially already overclocked 1.25 GHz G4s....
Okay, I got a clue and went and checked everymac.com.
The single and dual 1.25 GHz G4 MDDs are built with PPC7455s which have a 256K on-chip L2 cache. The single has a 2 MB external L3 cache. The dual has 2 MB external L3 cache, but I can't tell if that's per CPU or total.
The Xserve DP G4 appears to have the same CPU/cache arrangement, so that just leaves the question of whether the 1.33 GHz 7455 in the Xserve is more upgradable or just a higher speed binning of the same die as the 1.25 GHz.
I doubt it's worth the trouble to upgrade a dual 1.25 GHz MDD, but I might put a dual module in the single 1.25 GHz MDD I've got here.
But there are all those variations in on-chip cache and on-CPU module cache, and then the question of whether the 1.3 GHz chips might be more overclockable than the 1.25 GHz, or perhaps were built on the same die and so are essentially already overclocked 1.25 GHz G4s....
Okay, I got a clue and went and checked everymac.com.
The single and dual 1.25 GHz G4 MDDs are built with PPC7455s which have a 256K on-chip L2 cache. The single has a 2 MB external L3 cache. The dual has 2 MB external L3 cache, but I can't tell if that's per CPU or total.
The Xserve DP G4 appears to have the same CPU/cache arrangement, so that just leaves the question of whether the 1.33 GHz 7455 in the Xserve is more upgradable or just a higher speed binning of the same die as the 1.25 GHz.