Asus M5a99x evo r2.0 AMD 8350 kingston hyperx crucial m4 ssd sata problems - bios? overclocking?

If I have styled the problem wrong or asked in the wrong place, I apologise. This is my first question.

ASUS M5 A99x Evo R2.0
AMD FX8350 black 8 Core Processor (4.0/4.2GHz, 8MB Level 3 Cache, 8MB Level 2 Cache, Socket AM3+, 125W, Retail Boxed)
Kingston HyperX Genesis DDR3 1600MHz CL9 8GB x 2
MSI Nvidia GTX 760 2GB DDR5 TF Fan PCI-E Graphics Card
Crucial M4 256gb ssd hdd
Other sata hdd for storage

Zalman CNPS9700-led CPU Cooler
Kingston HyperX Genesis DDR3 1600MHz CL9 8GB - added another 2 sticks.
Crucial CT120M500 SSD1 2.5-inch 120GB M500 SATA 6Gb/s (recognised fine in bios and in windows when I can get there)

Problems encountered:
POST stopping at CPU. Solved by resetting cmos jumper
POST stopping at RAM. Solved by pressing MEMOK button. However, BIOS is only recognising 1333 not 1600 speed

BIOS not recognising SATA0 – the previously working SSD (one year old) HDD with windows 7.

new cables
switching cables
checking firmware
updating bios
removing other hdds

Problem half solved, in that BIOS occasionally finds SAT0 as HDD and boots from it. But randomly BIOS also finds SATA0 empty. “not present” and attempts to boot from a leftover windows vista remnant on one of the storage hdds.

When windows does boot, CPUZ finds the CPU running at over 4000mhz (up to 4200 before it crashes).

Can't tell whether windows BSOD is caused by random unwanted auto-overclocking of cpu
or BIOS randomly deciding not to recognise the SDD HDD boot disk anymore.

Have wiggled all cables I can find.
Temperature of CPU nice and low, temperature of mobo nice and low. No problems accessing other hard drives, USB memory sticks, dvd appears to work ok. Graphics card and sound all happy. PSU less than a year old. RAM manufactured in 1 and 2 months ago for each pair. Cables all neat, no shorts obvious. Case fans all happy.
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More about asus m5a99x evo amd 8350 kingston hyperx crucial ssd sata problems bios overclocking
  1. Check if the problems go away removing second set ram!
  2. Best answer
    This is what two memory manufacturers say about combining multiple kits of memory.
    G.Skill FAQs:
    I want to install more memory, in addition to my existing memory kit. What are my options?

    We do not recommend mixing memory kits, regardless of brand or model.

    By mixing memory kits together, there may be compatibility issues such as unable to boot or unable to operate at rated specifications.

    Each of our memory kit are thoroughly tested to ensure compatibility within each memory kit. And because we have not tested our memory kit with your existing memory kit, we cannot guarantee compatibility when multiple kits are used.

    Which Corsair Memory modules will work with my existing modules?

    We strongly recommend matching the module part number as closely as possible in order to ensure the greatest chance of compatibility. Even if you match part numbers properly, we can?t make guarantees as to their performance as the modules weren?t tested together. Also be aware that when using two kits of memory together, you may need to reduce the speed of the memory due to motherboard chipset limitations.
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