You'll have to be patient. There's a limited number of users on this forum and they aren't around 24 hours a day (it may not even be day where some of them are). I'm sure if somebody knows the answer they'll post it. It will take pretty specialized knowledge. I could only find one web site that even mentioned those two processor models.
It seems the difference is mainly one in power consumption, but then I have two cars identical in year of manufacture and model, but since they were made in two different months you notice little differences which mean parts from one won't work in the other.
Only the EEE code will help determine compatibility.
EEE Code Note: All Apple Processor have a special three digit "EEE" code embedded in the Processor serial number which positively identifies the part. Please note that this is the serial number of the Processor, NOT the serial number of the machine. The Processor serial number is on a tag which has the format "xxxxxxxEEEx". The "EEE" code is the three letters immediately preceding the last digit of the serial number.
- Part Number: 661-3331
- Product EEE Code: R06, R2R, R2S, R2T, R2U, RDV, RDW, RDX, RDY, RDZ
- Compatibility: Power Mac G5, Power Mac G5 (June 2004)
- Part Number: 661-3144, 661-3144-R
- Product EEE Code: P11, Q7A, Q7B, Q7C, Q9C, Q9D, Q9E, QA3, QJJ, QJK, QJL, QJM, QX5, QX6, QX7, QX8, QX9, QZZ, R00, R01, R02, R03
- Compatibility: Power Mac G5
- Part Number: 603-6894
- Product EEE Code : SLK, SLL, SY9
- Compatibility: Power Mac G5, Power Mac G5 (Early 2005)
ok ok, the serial number that the seller gives for the processors is: Part #630-6606 - #J54227002GRDW8, my question is if the serial number is the same on both CPUs since he only gave that number and they are pull outs from the same machine. My PowerMac's model year is June 2004 according to "techs specs" at the apple support site where you enter the machine's serial number. I'm not even going to bother looking at my bad CPU's serial number since they are not the original ones.
If you do not seperate the CPU and heat sink, one might assume that the old compound is present and adequate.
However, because one does not know exactly what has or has not been done, I believe it to be prudent to seperate the parts, check the condition of and likely replace the thermal compound.
Thermal compound isn't forever.
Mainstream compounds last 5 years max.....