007, thanks for your reply! Here are the components of my build:
GIGABYTE GA-X58A-UD3R LGA 1366 Intel X58 SATA 6Gb/s USB 3.0 ATX Intel Motherboard $209.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128423
Intel Core i7-930 Bloomfield 2.8GHz 4 x 256KB L2 Cache 8MB L3 Cache LGA 1366 130W Quad-Core Desktop Processor $288.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16819115225
Note: Combo deal for MB and CPU $473.98
SAMSUNG Spinpoint F3 HD103SJ 1TB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive
http://www.newegg.com/Product/Product.aspx?Item=N82E16822152185
G.SKILL PI Series 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL7T-6GBPI
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231335
CORSAIR CMPSU-750TX 750W ATX12V / EPS12V SLI Ready CrossFire Ready 80 PLUS Certified Active PFC Compatible with Core i7 Power Supply $139.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139006
XFX HD-585X-ZNFV Radeon HD 5850 1GB 256-bit DDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card w/ Eyefinity $309.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16814150491
COOLER MASTER HAF 922 RC-922M-KKN1-GP Black Steel + Plastic and Mesh Bezel ATX Mid Tower Computer Case $109.98
http://www.newegg.com/Product/Product.aspx?Item=N82E16811119197
LITE-ON Black 24X DVD+R 8X DVD+RW 24X DVD-R 6X DVD-RW 12X DVD-RAM 16X DVD-ROM 48X CD-R 32X CD-RW 48X CD-ROM 2MB Cache SATA 24X DVD Writer $27.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16827106334
Microsoft Windows 7 Ultimate 64-bit 1-Pack for System Builders – OEM
http://www.newegg.com/Product/Product.aspx?Item=N82E16832116762
I chose this sherman tank of a case precisely for the extra room and cooling capacity. In regad to overclocking, I called Gigabyte tech support to confirm the bios settings after the first Prime 95 stress test, and he had me adjust the frequency to 1600 to match the RAM, but other than that he thought everything looked good.
Last night I was installing files, software, and doing a couple of things while running the core temp program. The load never got above about 20%, and the temp peaked at 50c briefly, but mostly ran at 38-40c.
I then downloaded real temp and ran both temp programs while starting Prime 95 for Windows 64 bit blend test. The temps went immediately into the 80's and 90's on both temp monitors, and my son thought he heard a high pitched sound coming from the case. I immediately stopped the test.
All fans are spinning. I can check RPM's, but will have to do that later when I get back home. The case is not restricted in any way, and is open to air ventilation. The system acts very very stable. I also can't account for the earlier reading well above the point the CPU would have shut down.
I guess I can check the CPU HS mounting, but since it just snaps into the MB I am not sure how that could be buggered up. The CPU came with pre-applied stripes of termal paste.
Really flummoxed here, and worried. After checking the CPU fan mounting, I am not sure what to check yet. Looking for more suggestions.
RICK