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  1. I just bought 4 x DIMMs on eBay that were described like this: Corsair Vengeance 32GB (4 x 8 GB) DDR3 2400 MHz RAM in Red No Signs of any use or damage and work perfectly, very fast RAM! Please Note that 2 of the sticks have a carbon vinyl on the side as shown in the photos, which can be removed if necessary but can be hidden once inside a PC if put inbetween [sic] other sticks. When I received them, my PC wouldn't boot with them in unless I disabled XMP, and then CPU-Z said this about them: Slots #1 & #3: ============== Part No: CMY16GX3M2A1866C9 Timings Table: JEDEC #2 JEDEC #3 JEDEC #4 XMP-1864 Frequency: 457MHz 609MHz 666MHz 932MHz CAS# Latency: 6.0 8.0 9.0 9.0 RAS# to CAS#: 6 8 9 10 RAS# Precharge: 6 8 9 9 tRAS: 17 22 24 27 tRC: 23 30 33 36 Command Rate: 2T Voltage: 1.50V 1.50V 1.50V 1.500V Slots #2 & #4: ============== Part No: CMY16GX3M2A2400C11 <== 2400 vs 1866 Timings Table: & 11 vs 9 JEDEC #2 JEDEC #3 JEDEC #4 XMP-2400 <== 2400MHz vs 1866MHz Frequency: 457MHz 609MHz 666MHz 1200MHz <== 1200MHz vs 932MHz CAS# Latency: 6.0 8.0 9.0 11.0 <== 11.0 vs 9.0 RAS# to CAS#: 6 8 9 13 <== 13 vs 10 RAS# Precharge: 6 8 9 13 <== 13 vs 9 tRAS: 17 22 24 31 <== 31 vs 27 tRC: 23 30 33 44 <== 44 vs 36 Command Rate: 1T <== 1T vs 2T Voltage: 1.50V 1.50V 1.50V 1.650V <== 1.650V vs 1.500V I can see they are different specs or speeds, which, I suspect is why two are missing the spec stickers. :-( Anyway, in all fairness, I've requested a refund (I paid £140 GBP) and I've now received the return ticket so I guess that means he's accepting the return. Does anyone know whether this is why my system won't boot with XMP enabled? I had assumed that they would just all run at the slower 1866MHz rather than the faster 2400MHz of the other pair, but it seems that they don't work at all together unless on the default setting, which, I believe, is slower and makes my purchase a bit of a waste. Presumably, if I had 4 x CMY16GX3M2A2400C11 rather than 2 x CMY16GX3M2A2400C11 + 2 x CMY16GX3M2A1866C9 then they would all run happily together at the higher speed? One more thing: CPU-Z seems to be suggesting that the maximum bandwidth is currently 667MHz - is that correct, and would those speeds increase to 932MHz for the slower and 1200MHz for the faster modules, if only they were used on their own or with matching modules? Thanks to anyone who answers and sorry if my questions just prove that I don't know what I'm talking about - I'm a developer so this is way out of my field of expertise, but I just want the best performance I can get on a budget. Paul
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