PC does start with different ddr2 rams but not together

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regort

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Dec 25, 2015
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Hi there!

So I encountered with this issue. I have an old PC with a gigabyte ga-ep43-ud3l MB and 4 gig of ram. One of them is a 2 gig Kingston KVR800D2N5/2G and the other is a Kingmax KLDE88F-B8KUS both of them are DDR2-s with 800 MHz of clockspeed, work fine.
Now I managed to get some extra memory since I have 4 memory slots on the MB. 2x2gig of Nvidia SLI ready PC2 6400 ddr2 rams (PN: OCZ2N800SR4GK).

The Pc boots both with the first 2 and the second 2, but not together. When I mix them it`s either beeps one and turns off ( when I mixed the new rams with the old ones in the same channel) or goes to the screen of the Mother board ( when I leave the old ones in one channel and the new ones in the other) then turns off.

The voltage was different but I raised it to 2.1 since the new ones need 2.1 but the old ones are 1.8. I was trying to play with the memory timing but had no success.
If anyone has an idea how could I get them to work together it would be much appreciated!

Best regards,
-regort
 
Solution
Lutfij
The first order of business is to not mix two sets of rams let alone a kit and 2 sticks of varying brand name and quality in a system. According to your product specification page the maximum ram voltage for your motherboard should not exceed 1.8v. The kit that requires 2.1v of power are in fact older versions of DDR2 ram. After manufacturing processes improved the voltages for subsequent DDR2 and later on DDR3 were at 1.8v.

You could try and run all of your ram at 6-6-6-18 at 800Mhz but getting the system to post with all of them in would be the challenge as nowadays motherboards come equipped to run with the lowest timings to ensure that users can get into BIOS. You can try removing your CMOS battery for 5 minutes before...
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Lutfij

Lutfij

Titan
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Oct 7, 2009
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The first order of business is to not mix two sets of rams let alone a kit and 2 sticks of varying brand name and quality in a system. According to your product specification page the maximum ram voltage for your motherboard should not exceed 1.8v. The kit that requires 2.1v of power are in fact older versions of DDR2 ram. After manufacturing processes improved the voltages for subsequent DDR2 and later on DDR3 were at 1.8v.

You could try and run all of your ram at 6-6-6-18 at 800Mhz but getting the system to post with all of them in would be the challenge as nowadays motherboards come equipped to run with the lowest timings to ensure that users can get into BIOS. You can try removing your CMOS battery for 5 minutes before replacing to see if that helps detect all the ram and allows you to get into BIOS though be warned clearing your CMOS would require you to input all the remaining settings manually.

In a nutshell, get a matched pair of higher capacity rams that are rated at 800MHz/1066MHz at 1.8v like this. Ebay or Craigslist will hold alot more in store.

*You shouldn't mix and match ram kits. It just brings a new problem to the table to solve. The higher voltage ram kit will eventually degrade the lifespan of your memory controller(in your northbridge) and thus the system.
 
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