Memtest86+ failed

Hi, please help me understant a problem with my PC.

I have confiuration:
CPU: AMD Phenom II 1090T 3.2Mhz (nominal mode);
MB: Asus M4A89GTD PRO/USB3 (w/o overclocking);
RAM: Kingston KHX1600C8D3K2/4GX (4x2G, total 8GB, all banks filled);
VIDEO CARD: onboard;
HDD: Seagate green 2Tb;
FANS: 3x80mm;
PSU: Cooler Master RS-450ACLY (450W) (also tried Chieeftec APS-500S).

First of all when my system can't resumed after long time being in hibernate (Win7), and only resumed after reset pressing I decide to check first of all HDD and RAM. Checking of HDD done with no problem. Then I launched memtest86+ v4.20 for each RAM kit (2x2GB) in each bank (firstly in A and then in B) for long period of time - 24h. Continuous tests passed with no errors. When I set both RAM kits in all banks, memtest has not passed. Error 1 usually at the size 6912.9 MB (good ffffffff bad fffffff7f) when test run for a long time. Time when error appears depend of BIOS version. For latest BIOS 3029 test failed after 20-30 minutes, for previous version 2301 it failed after 11 hours, for oldest version 1606 it failes usually later - after 19 hours. I confused what is wrong with PC components. Is it problem in MOBO, CPU or memory modules (but they passes tests separately even for 24 hour). In BIOS I only had set timings 8-8-8-24 (according to Kingston specification) and DRAM frequency to 1600 Mhz, with voltage - 1.65v (also to specification values).

P.S. For timings 9-9-9-24 (all auto in BIOS) memtest passed even for long time - 24 hours as minimum.

Sincerelly grateful for helping.
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More about memtest86 failed
  1. You can disable the hibernate option easily, which also creates extra space on your hardrive. It's best used with laptops to improve battey life. My sleep shutdown option still works fine with this function disabled. If it doesn't work well, then you can enable it easily.
  2. In general I had found that hibernate option is very convinient as functionality. Usually I can stop my work at the appropriate point and then after resuming continue it. The only one downside is slow resuming with my Seagate green SATA drive. But I think if I use SSD as system drive in future resume process will be faster.
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