If there is no option 1.8, then you should get new sticks compatible with your motherboard, or a new motherboard compatible with your sticks. CPU and RAM are like heart and veins in humans, if there's a clot or something else blocking the circulation -- there you go.
there is only 1 thing to realize being incompatible RAM does indeed cause freezes and crashes.
I may look stupid quoting myself, but this is true:
If your RAM sticks are set wrong, or if they are mismatching, or not supported by motherboard, your BSOD thread will grow many pages and yet you'll be having crashes. Sorting software and drivers won't help, and memtest will not necessarily detect errors.