I have a similar issue, I just bought a tower off a guy that was hurting for cash and I got it for a good deal I think $500, It is listed as a Intel Core 2 Extreme QX6800 Kentsfield @ 2.93Ghz Socket 775 with CPUZ and under Specification it is listed as Q6800 ES, When I looked on the CPU it say's Intel Confidential QXWX ES ...And there is some other numbers on the processor, It is hard to make out. I myself was told that this was a good CPU and that it is very exspensive to buy. I am not sure if it is a good CPU and whether to sell it and grab something else or to just keep it. As for the rest of the PC I will list below what it came with, and if anyone could let me know if you think I paid a fair price or to much for it. The specs below are what I bought it with a week ago. And the fellow I got it off told me he bought this all brand new about 8 months ago and he paid a lot for it.
-Intel Core 2 Extreme QX6800 @ 2.93GHz LGA775
-Intel Extreme D975XBX2 Motherboard
-4GB Patriot Extreme Performance DDR2 PC2-6400 Low Latency PDC22G6400LLK 4 x 1GB
-Zalman CNPS9700 LED 3 Speed CPU Cooler With Fan Mate Fan Control
-Antec 900 Gaming Case 4 Fans LED
-MSI GeForce NX8800 GTX HD-OC 768MB
-Thermaltake TR2 550W Power Supply
-1 x Western Digital Raptor 160GB WD1600ADFS 10,000Rpm SATA
-2 x Western Digital 160GB WD1600AVBS 7200Rpm SATA
-LiteOn 20X DVD-RW With Light Scribe SATA
-2 Black Light Cathode Lights