I bought 4 more of these last week for an old X99 Sabertooth and only installed 5 days ago. They were immediately recognized in the Bios and Win10 the first time they were switched on and went through the stress. This is the last RAM upgrade for this mobo bought in 14 and now all channels are full. I've been using these Crucial 4GB sticks all the time, no problem. While running a decent CPU overclock, I leave the RAM at stock speeds as the boost doesn't seem worth the watts/heat. I got them 20% higher than stock, but the controller got warm (even with more than proper airflow) and the overall temperature went up 2 degrees Celsius. The sticks weren't buggy for me up to about 25%, but they worked stably at 20%.
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