Corsair tech also said to run it at 667 mhz.
Updated bios to 1401. Set manually to 555 18 at 1.9 volt.
Friday night ran 1 set overnight with memtest 3.4 and 2 full passes no errors.
added both sets of 6400c5 2x4096, set mem clock to 400mhz, test 7, 291 errors, showing 161 in slot 0 and 131 in slot 1.
Reset mem clock to 333mhz. Testing both pairs, memtest 3.4 shows test 7 errors of 24, 14 in slot 0 and 10 in slot 1.
Rest mem clock to 400mhz. Loaded HCI memtest along with cpuz and core temp. Testing both pairs, HCI test find memory error and identifies 1 dimm pair as not correctly storing info. Removed 1 set and test first two slots. HCI says no errors. Core temp shows high of 44C and 37C core temp. cpuz shows 2900mhz on processor, mult 14.5, bus 201, ht 1004.9mhz. Memory at 362mhz
Take set two, slots 3 and 4, and place in dell e521. memtest 3.4 shows no errors. hci says no errors.
Place four sticks of corsair 1gb 6400c4 in computer filling all memory slots, mem clock still at 400 mhz and test overnight with memtest 3.4. Two full passes with 0 errors. Testing with hci at this time.
These two pairs of ram work individually but are not compatible? Seems to me if memory controller issue the four 1gb sticks would not work, unless the amount of memory affects the controller. Seems like a big deal to me if there are limitations on memory controllers. Is not the future 64 bit and large amounts of ram. Has the future come to soon?