Different Latency Mixed Ram and Memtest Results

Feb 23, 2018
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Hey everyone. Long time lurker. Been looking for an answer to my situation but no dice. I've recently been dabbling with desktop PCs and picked up some RAM from the local listings. Total of 8gb, 2 sets of 2x2gb DDR2800 kits from OCZ and Samsung. I've thrown them into my desktop and it boots up just fine and has been running well with mild gaming, web browsing in the past 5 days. I've recently noticed that the two brands have same voltages (1.8V) but slightly different timings; one being 5-5-5-18 and the other 6-6-6-12. I've read enough threads saying its not recommended to mix but if it boots up, then all is dandy. I proceeded to do a Windows Memory Diagnostic and 1 pass of Memtest86 where both reported to be error free. At the moment, I'm in the midst of doing an overnight Memtest86 and 16 errors have already cropped up in test 7 on the first pass. Since I haven't run into any problems with Windows yet, should I look further into this based on the results so far? Should i go into my BIOS and change the latency timings, and if so, what should the values be?

My Specs are:
Core 2 Quad Q9400
Asus P5QL Pro
8gb DDR2 800MHZ (2 kits of 2x2GB)
Crucial MX300 250GB SSD
Gigabyte 1030GT 2GB
Thermaltake 430W PSU