New Ram + Old Ram = No POST, New = Post

February 19, 2011 at 07:45:45
Specs: Windows 7
Just upgraded my comp with two 2GB sticks of DDR2 800MHZ, and with the old ram it will not post.

I was running 4gb of ram prior, at 4 1gb sticks, two at 800mhz, two at 667mhz. I was hoping to keep the two sticks of 800mhz and just have a solid upgrade to 6gb @ 800mhz.

However, if I have any sticks of old ram in the slots, it won't post. It will still post with the old ram, and it will post with just the new ram. So I'm a bit in a confusion as to what's causing this. I reset the BIOS in an attempt to clear out some old crap that may have caused a compatability issue, but no luck there either

CPU = AMD Phenom X2 550
Old ram = 1gb of Crucial Balistix and 1gb of Patriot
New ram = 4gb of PNY

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February 19, 2011 at 07:53:52
"I was running 4gb of ram prior, at 4 1gb sticks, two at 800mhz, two at 667mhz"

Just to be clear, if you pair up DDR2-667 with DDR2-800, ALL the RAM will run at 667MHz unless you manually reconfigure the memory settings in the BIOS. But there's no guarantee that DDR2-667 will run at 800MHz, that's why it's sold as DDR2-667 rather than DDR2-800.

Compare the voltage specs of all your RAM.

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February 19, 2011 at 08:19:28
Yea, everything is running at the same, 2.0v, and it's all running at 4-4-4-12, so I'm really confused now, I just tried it with one stick of old and one of new, and it boots, but the moment I add in another stick, I get a post beep, then another, and nothing.

I even tried one 2gb in a1, one 2gb in a2 and one of the old 1gb sticks in either b1 or b2, same result with the double beep.

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February 19, 2011 at 09:04:08
Being that you have a Phenom based CPU, you should be running DDR2-1066. And DDR2 memory is supposed to run at 1.8v, therefore the RAM you have is probably so-called "gaming RAM". It isn't true DDR2-800, more than likely it's DDR2-667 that has to be overvolted to run at 800MHz with those particular memory timings. That doesn't answer your question, it's more FYI.

Try manually configuring your RAM settings. Set the voltage to 2.0v, set the speed to 800MHz & set the timings to the weakest of the bunch. In other wrods, if you have CAS6 & CAS4, configure for the CAS6 settings. BTW, if you don't have the 64-bit version of Win7, your system can't make full use of 4GB, let alone 6GB.

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