No, the 55xx models are all for dual-processor systems while 35xx models for single-processor systems as shown here. The difference between "W" and "X" is for different TDP, 130W vs 95W. However Intel abandoned the "W" prefix for the 56xx models even though there are several models with 130W TDP.I'm not familiar with swapping CPU's on Mac Pros, but aren't the W55xx models only for single CPU systems and the X55xx models for the dual CPU systems?
I am sorry that you have had so much trouble with this. I too had alot of trouble.
It is not a straightforward update and there just isn't a precise "right" way to do it.
I thought I had killed my CPU tray and bought another one, but I was able to get the 2.26 Quads to work in the "dead" one so it isn't dead. I used little mylar washers and some heat foam stuff for the other chips. It is crucial that you make sure the fan connector gets snapped in.
The RAM isn't important, in fact, it helps diagnose the CPU
I can run with just 1 or 2 sticks. Some RAM slots didn't work until I tightened the screws a little more or loosened them.
I posted in one of the bigger threads here.
If you are in LA I would be happy to help if you bring it by, I am in Hollywood near the Dolby Theatre (where Emmy's are)
If not, there is a vendor on Ebay (I have no affiliation, don't know the guy, never met him, etc) who upgrades 4,1 trays. I am going to buy a couple more heatsinks and some more 5680s and see if I can get my "spare" tray working that way.
Good luck. I eventually got Dual 5680s working and already having a machine that is FASTER than any Mac at the Apple store and can match the Geekbench of new one makes me very happy indeed.
You need 2 x series cpu's. Can't put in 2 x W series.
W5590 is a dual processor model. Intel lists it as such. Others have already installed them in DP Mac Pros successfully.
Who has?
Sent back the W5590s I spent weeks wrestling with and ordered a different pair from the US. 20 minutes installation time and they booted first time. Unreal. Only issue now is the RAM won't run at 1333 despite numerous PRAM resets. Ho hum. Yay!
^^^^I just posted this answer to your PM:
I idle at middle 30s to middle 40s. I went to CPUBOSS and they list the max operating temp at 67°C for the W5590. I haven't really stressed mine, but I have never seen temps as high as yours. I don't use handbrake. Also CPU A seems to run a bit hotter than CPU B.
I'm actually feeling a lot better about it -- really appreciate the responses. I took the chips out and swapped their locations, reapplied the compound, etc. Seems to be running a little cooler, and the discrepancy between the two is more inline. Before, under handbrake, A would hit 85, B would be at 65, and the fans would be spinning at 5000 rpm. Now, A hits 80 and then cools down a degree or two, B hits near 70, but the fans are only spinning around 3000 rpm. This seems a lot more inline I think, no?
Currently midway through a long Handbrake session with default fans settings:
Temps =
CPU A = 75
CPU B = 67
Northbridge = 61
Booster fans around 2300rpm.
Apparently according to Intel, 104 is the Northbridge limit for the W5590s
http://pindelski.org/Photography/2013/07/06/mac-pro-2009-part-x/
Idling temps:
CPU 1 = 49
CPU 2 = 40
Northbridge = 74
Booster Fans = 1113 /4
Still trying to get my head round the temps thing....