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Problems mixing in new memory with old

Last response: in Memory
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September 11, 2010 10:04:49 PM

hello i have a pretty new gigabyte motherboard- gigabyte x58 ud4 , which has 6 ram slots in it. till now ive been running 3 1gb ram sticks in tripple channel- ocz 1600 7-7-7@1.65v ddr3. today i tried installing in the other 3 slots 3 4gb sticks-ocz 1333 9-9-9@1.65v ddr3 , so all the slots are full for total of 15gb. but with these new 3 sticks computer wont even start up, i turn on the computer and nothing no start up screen,bios... im thinking that its because of the diff frequencies or timings, ne ideas n solutions? thnks

i7-920
windows 7 64 bit

More about : problems mixing memory

a b } Memory
September 11, 2010 11:17:20 PM

Does the computer boot if you remove the original 3 sticks and leave in the 3 new sticks?
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September 11, 2010 11:22:51 PM

nope :(  , just took out original 3 and same thing; monitor just blinks as if in stand by mode and no hd activity. does this mean motherboard doesnt support them and theres no sollution?
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a b } Memory
September 12, 2010 7:37:25 AM

Hello and welcome to the forums
Try testing each of the 3 new RAMs simultaneously and see if it works fine or not.
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September 13, 2010 11:56:26 AM

ok just did some more testing, all testing with none of the old sticks in the computer, now again when only the 3 new sticks in tripple channel are installed, computer wont boot. but i just tryed installing the new sticks individually and computer works. so with only 1 of the new sticks (4gb) installed the computer boots fine but with all 3 sticks together problems. i tried all 3 individually to see if one is maybe deffective and they all work by them selves, just not together. ne ideas?
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September 13, 2010 12:37:30 PM

hey guys another update, also having success with only 2 new sticks installed in dual channel mode, but in system it says next to installed memory (RAM) 8.00 GB (4.00 GB usable)

i dont get it im using windows 7 ultimate 64 bit edition, shouldnt memory limit be more than 4gb?

edit: never mind about the 2 sticks working together, i just shut off computer and rebooted and same issue. seems that i got lucky one time that the computer booted with 2 sticks. please someone help very confusedd
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a b } Memory
September 13, 2010 1:09:14 PM

Have you adjusted the speed and timings in the BIOS to match the new SLOWER speed and timing ?? If you are trying to run 1333MHZ CAS 9 RAM modules at 1600 CAS 7 then you are probably not going to have much luck --- Boot into BIOS with the single stick (or one of the old modules) and adjust the timings and speed to 1333MHZ> and CAS 9 timings - save the settings - shut down and put in the new modules and try booting.
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September 13, 2010 2:04:10 PM

just reflashed bios to newer version, problem solved :) 
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