Originally Posted by jongig
...I will probably put my 960 chip on ebay and try to pick up a D945 since we know they work. I can't find any information about our P5LP-LR motherboard and I can't find any way of determining what chip will work in the PC...
Before you lay out any more money, you need to start focusing intently on the sSpec number of your chips. For instance, the D960 has at least 2 different sSpec versions:
The version you have - SL9AP/130W http://processorfinder.intel.com/det...px?sspec=sl9ap
A lower-power version - SL9K7/95W http://processorfinder.intel.com/det...px?sspec=sl9k7
Since you can't find any motherboard information, you need to read the sSpec number off your chip (which will probably require removing it and cleaning off the thermal paste to read the inscription). Then search for that sSpec on the Intel website. It looks like the D925 chip has been sold with two different sSpec numbers - SL9KA and SL9D9. They both are 95W versions. The only difference I can see is the Core Stepping spec, and a slight difference in max. allowable voltage.
To upgrade this processor without motherboard information, you need to pick an sSpec that is as close as possible to your current one. I do not know how important the Core Stepping spec is, so I cannot tell you whether that needs to be the same. I suspect there is a page or whitepaper somewhere on Intel's website that would explain this.
In the case of the D945, it does look like it has only been made under one sSpec number, so if others have made the D945 work with your motherboard, hopefully they all would work. Based on this, it also looks like my D950 (SL95V) might work for you. But there are no guarantees. Based on these specs, you would think the D960/SL9K7 would work on my motherboard, but the link I posted previously makes it clear that nothing above D950/SL95V will work with my motherboard.
Please note that I do not have an HP z5xx computer, so none of this is based on any experience with your motherboard.