Reply 40 of 62, by Mike V8
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andyc wrote on 2020-12-24, 13:55:Paadam wrote on 2016-09-18, 08:24:I have Dell Precision 620 board with PSU and accessories (pretty much everything except the case), I am planning to get the board to run 2MB CPU's on 133 MHz bus (with lower multiplier). On Dell you set the CPU speed with floppy disk (utrility called sprfrq2.exe). It basically sets multiplier and the resulted speed cannot exceed rated CPU speed, otherwise the board wont' boot iirc. I had a complete 933 MHz Precision 620 once and experimented with it, though did not have 100 Mhz CPU's to test. But it had CPU speed option in BIOS ("Compatibility") which seems to be 100 MHz speed setting and on the board there is unsoldered jumper stating "100 Mhz" so it is possible that it works.
Though not sure I can get it to work at 133 Mhz FSB. I can live with 700 or 900 MHz CPU but I want it to work at 133 MHz bus speed 😀 100 MHz seems such a waste for that reat CPU.Hi! I also have a Precision 620 currently running 2 x 1Ghz 256K 133Mhz Xeons. Would 2 x 900Mhz 2MB work with it? I would like to see how they perform vs the 2 x 1Ghz that i have and don't want to buy them if they don't work since they can get quite expensive...
Thanks!
I'm pretty sure the 2MB Cascades would work even though they were not meant to be used with the i840 Carmel workstation chipset. I've successfully upgraded my Compaq 840 based workstation with a pair of 2MB 900MHz Xeons and did a comprehensive comparison with the old 1GHz 256K Xeons it used to have.
In every single test 900/100/2M was faster than 1000/133/256K averaging about 20%. In some games such as Quake III the 900 was faster by 60%!
Also what's pretty impressive, in several tests these 2MB monsters were faster than the Tualatin-S 1.4/512K and even Rambus-based 1.5GHz Willamette P4.
My machine also has a hidden 100MHz jumper that forces 1GHz to work at 750MHz but it won't overclock 100 to 133. I was hoping to get a 933/2M by forcing 700/2M to run on a 133MHz bus but unfortunately couldn't find a way to do so. Still, even though 2MB Xeons run at 100MHz bus they're fantastic chips that can put much higher clocked siblings to shame. You would never guess that a 900MHz P3 could beat 1.4GHz P3.