Back in 2007, I decided to give it my all and build a cool $2,500 PC. First Intel quad-core processor at 3.4 GHz, 4 x 1 GB configured DDR2-836 memory on Intel D975XBX2. It was once a top-of-the-line machine that could rival $1,000 processors in benchmarks. Now the processor costs 10 dollars. This old setup still works with a smile, sometimes 24 hours a day, 7 days a week. It went through 2 power supplies, 3 hard drives and 7 GPUs. 4GB of RAM is pretty good these days - maybe on a phone. I decided to upgrade this old horse to 8GB RAM. My 4x2GB kit arrived quickly in a padded envelope. I installed all 4 RAM sticks and was greeted with a black screen. No memory error is reported. I took out 2 sticks and rebooted, then I got into the bios. I saw that my bios can't run 2 sticks at their 6-6-6-18 speed because the middle 2 numbers in my bios don't even go to 6 lol. I manually set 2 sticks to DDR2-667 6-5-5-18 1.8V and rebooted. On Windows (7x64) I ran CPU-Z to check the modules. There I noticed that the SPD tab was populated with the correct JEDEC numbers. This greatly increased my confidence in these unnamed RAM modules. DDR2-533 and DDR2-667 with 5-5-5-15 @ 1.8V are acceptable according to the SPD of these modules, so I turned off the computer and went back to the BIOS. Put 5-5-5-15 1.8V and restarted, still only 2 sticks. Black screen. Hmm, I thought. Knowing that some DDR2 modules require more than just JEDEC 1.8V (some up to 2.3V), I increased the RAM voltage to 1.9 and rebooted. This brought me back to windows and I tested the modules with memtest and they came out great. I turned off the computer and pulled out 2 modules and replaced them with 2 others. I rebooted and checked them. You passed too. I then installed all 4 modules knowing each module worked. This is where things got really weird. After a long trial and error, I finally got all 4 modules to work with DDR2-667 5-5-5-15 1.96V and also increased the northbridge voltage (MCH) by one level. DDR2-800 doesn't work for me at all. So far the setup is stable as usual, but I can no longer overclock my CPU. Any change in the above values other than voltage will result in a black screen. This makes me very sad because now the frequency is below 3 GHz. Overall, I somewhat disagree with this update. I lost CPU speed and RAM bandwidth compared to my configured 4-4-4-12 2.0v G.Skill modules. These modules required almost the same voltage as my old ones and they also required me to increase the MCH voltage. At DDR2-667 5-5-5-15, these modules require more voltage (1.9+) than their JEDEC states. Those 6-6-6-18 timings are horribly loose and outside the range of typical JEDEC for DDR2-800. I can't even run them at that spec, they're so big. But you know, I'm glad they work! I recommend them for those with an older computer that needs more RAM.
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