Trying to add more ram to my desktop.

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Jdog1300

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Hello all,

I have an NVIDIA nForce 650i ultra motherboard that has the capacity of 8gb of ram (jedec 800mhz). I have 2 1gb already installed. So, I went into CMOS and reset to defaults. Then, I unplugged everything and intstalled 2 2gb in the remaining two slots that were left. When I turned on my PC, nothing on the monitor would come up. Any suggestions?

Thanks,
Jameson
 
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damian86

damian86

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What cpu master says makes sense, it is quite hard to combine different specs ram, such as modules that work on different frequencies, even if you select from bios to work on the same ones, as long as they are compatible. I would suggest booting up with your new ram sticks and then try to play about with your old ones, if they 'bsod then most likely that they don't like each other.
 
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Jdog1300

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volcanoscout

volcanoscout

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Jdog, if you tried to post a reply, it didn't come through.
 
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Jdog1300

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Feb 2, 2015
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Jdog1300

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I have a pair of skilz 1gb pc2-6400 in the white memory slots and a pair of the patriot gaming series 2gb pc2-6400 in the black slots. Once I added the Patriots the pc wont boot.
 
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Jdog1300

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volcanoscout

volcanoscout

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Install just the 2GB sticks, using the white slots, and see if it will boot. If that works, then shutdown and add the 1GB sticks in the black slots. If that doesn't work, we'll take a look at the voltage and timings once you post the model numbers.
 
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Jdog1300

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Ok I took out the 2 1gb Gskills model number: F2-6400CL5D-26BNQ 1.8v to 2.0v. And put in the Patriot 2 2gb model number: PGS24G6400ELK. In the white slots and the pc did boot.
 
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volcanoscout

volcanoscout

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Sorry for the slow reply - have been traveling. Did you try adding the G.Skill sticks into the black slots, and if so did it boot?

If not, there are two probable conflict areas: voltage and timing. The G.Skills apparently need to be at 1.9V to run properly in dual-channel, while the Patriots only need 1.8V. The G.Skills also have tighter timings (5-5-5-11 vs 6-6-6-18). There's really no way to check what the mobo is trying to default the mixed set to if it won't boot, so you'll need to boot as currently configured (Patriots in white slots, G.Skills not installed), then in BIOS adjust the voltage and then the timing if the voltage adjustment doesn't work by itself. (Running the Patriots at 1.9V won't hurt them.)

First, I would recommend downloading and running CPU-Z if you don't have it on already. (http://www.cpuid.com/softwares/cpu-z.html) Click on the "Memory" tab and make a note of whether the Patriots are running in dual-channel mode (Channels #) and what values are in the DRAM Frequency (this is your real clock freq which should be half of the rated or labeled speeds, or @400MHz in your case), and the first four timing windows (CL through tRAS). These should be showing 6-6-6-18.

Before I get too deep into how to make adjustments, I'll wait to find out if the two sets booted together with the larger sticks in the white slots and the G.Skills in black. If it did, please post the same values I listed above - even if they boot together, they may not be running at full speed.
 
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