Jeffrey Posted August 28, 2006 Share Posted August 28, 2006 Dear fellows, I just upgrade more RAM to my pc(AMD X2 4200+). Previously I was using 2 DDR400 512MB. after adding 1 DDR400 1G RAM. It appear on the startup screen that the RAM only run in DDR333 with 64bit which normally was 128bit.. Can anyone help? thanks in advance~! Cheers Link to comment Share on other sites More sharing options...
AJLynn Posted August 28, 2006 Share Posted August 28, 2006 Some AMD chipsets only support 2 higher capacity DIMMs in 400 mode. Check the specs from your motherboard manufacturer. Link to comment Share on other sites More sharing options...
Jeffrey Posted August 28, 2006 Author Share Posted August 28, 2006 Some AMD chipsets only support 2 higher capacity DIMMs in 400 mode. Check the specs from your motherboard manufacturer. Thanks, AJ. if I continue to use 2gig run under DDr333. Will it increase or decrease the performance? Link to comment Share on other sites More sharing options...
tecton3d Posted August 28, 2006 Share Posted August 28, 2006 Thanks, AJ. if I continue to use 2gig run under DDr333. Will it increase or decrease the performance? you have to match you memory in pairs to get the most out of it. If you had 2x 1gb sticks in the correct sockets (both 1gb sticks in a blue socket or both in a black socket) ~ you'd probably be running at the max your motherboard will allow (in this case 400). When you "mix and match" capacities without making sure the ram is symmetrical, like your 1x1gb + 2x512mb = 3 RAM sockets used instead of 4... for some reason that doesn't sit well with the mobo and it throttles back. to answer your question ~ it will decrease performance but probably not enough to worry about... if you're concerned about it run some benchmarks... or better yet ~ get another 1gb ddr400 stick Link to comment Share on other sites More sharing options...
AJLynn Posted August 28, 2006 Share Posted August 28, 2006 It will perform better than 1 gig at 400, assuming you do things that use the extra RAM. Also, there are two issues here - what Daron said, which is something that can get you especially with higher speeds and fast timings, and what I was talking about, which is that, matched pairs or no, some AMD boards are not able to use more than two high-capacity (two-sided) DIMMS at 400. You could get 4 matched 512s and only be able to run at 333, while 2 matched 1024 from the same product line would run at 400. Link to comment Share on other sites More sharing options...
Jeffrey Posted August 28, 2006 Author Share Posted August 28, 2006 THanks again for the information. I guess I'll just get another 1024 RAM. Yeah, I'd tried 4 512MB and it still run at 333. Link to comment Share on other sites More sharing options...
AJLynn Posted August 28, 2006 Share Posted August 28, 2006 Look it up in your motherboard docs first - we could both be wrong, and it's an easy thing to check. Link to comment Share on other sites More sharing options...
Jeffrey Posted September 12, 2006 Author Share Posted September 12, 2006 Look it up in your motherboard docs first - we could both be wrong, and it's an easy thing to check. Yeah, seems like you guys are right. My motherboard only support 2 channel of DDR400 and have to be indentical RAM. That means I have to buy anotehr 1G RAM~! Link to comment Share on other sites More sharing options...
AJLynn Posted September 12, 2006 Share Posted September 12, 2006 Yeah, RAM is tricky. The faster it gets, the tighter the requirements - for example, with the newer boards you can have dual-channel DDR2, but you have to put identical sticks in the two sets of slots (can't pair a 1GB with 2x512MB) and there are dozens of things that can make it unable to perform at spec timings. I was watching a thread on my MB manufacturer's forum where a guy had a 400MHz MB and good 400MHz RAM and no matter what he did he couldn't get it to run at 400MHz, even though he had apparently done everything right. Link to comment Share on other sites More sharing options...
hooman_71 Posted September 17, 2006 Share Posted September 17, 2006 hi I had similar problem with an AMD machine If ur Mainboard supports FlashBios upgrade the bios in the manufacturer Site It worked for me , hope work for u too. Link to comment Share on other sites More sharing options...
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