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I'm considering another 2x 8GB so will be interested to see how you get on. Don't think I've see a quality score that low, usually 90 percent plus. I'm not sure how it's calculated thought. Hopefully it won't affect you too much.Just got my 4000mhz 8gb x4 in along with the 3900x, looking forward to having a play.
Initially though zen DRAM calculator is suggesting only 86% quality on the bin. Will have to see what we can achieve when I get a chance to play.