Why won't my pc run with 6gb of ram?

[Kroze]

For some reason it won't run if I have 6th installed. The ram works fine if I install them separately.

Intel e8400 lga775
Gigabyte ds3l mobo
4gb ocz fatality edition ram (2x2gb ddr2 dual channel)
http://www.newegg.com/Product/Produc...82E16820227334

2gb gskill ram (2x1gb ddr2 dual channel)
http://www.newegg.com/Product/Produc...82E16820231098

Both are pc6400

Any idea?

 

[Burner27]

Perhaps these ram modules don't place nice together. You should stick with the same brand, capacity, timings, and voltage - ram modules.

Update your BIOS?

 

[semo]

Look in your motherboard's manual under RAM. The second memory channel may only support single sided RAM

 

[Kroze]

Thanks guys

 

[Burner27]

I have a Gigabyte GA-P35-DS3R mobo and although the OCZ memory I had in it ran well, it didn't work when I installed 2 x 2GB of Corsair memory along with it. It booted, but was very unstable. I have since switched to 4 x 2GB Corsair memory (same speed, timings, voltage) and it has been flawless since.

 

[semo]

maybe also try installing 1 gskill and 1 ocz module in various slot combinations. If there are no compatibility problems then it should work.

 

[Termie]

Sorry, but I don't think the above comments really hit the nail on the head here. You have two sets of ram spec'd to run at different timings and voltages. The OCZ ram requires higher voltage to run at its standard timings, and if you put it in with the G.Skill ram, you probably aren't going to have the proper voltage settings.

Here's what you need to do - go into the bios with just the G.Skill loaded, and manually set your timings to 5-5-5-18, 2.1v. That is more voltage than the G.Skill need, but unfortunately that OCZ set isn't particularly good, and needs high voltage to hit moderate timings. Once you have the voltage and timings manually set, reinstall the OCZ set. If it works, I'd try bringing the voltage down to 2.0v to reduce power, heat, and strain on the chips. The OCZ set, which is meant to run at 5-4-4-18, 2.1v, might just work at 5-5-5-18, 2.0v. But again, don't start at 2.0v.