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Gigabyte GA-MA770-DS3 DDR 800 Issues

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December 18, 2010 8:05:37 PM

I've been a home builder/enthusiast for years, but I've never run into a problem like this before. Anyway, system specs (Nothing is overclocked):

Athlon 64 X2 5200+
Gigabte GA-MA770-DS3 Motherboard, running F7 Bios
Geforce 8600GT
Logitech Media Keyboard elite
Logitech MX310 Mouse
SBLIve Audigy X2
WD Raptor 74
WD Raptor 37 (old school)
WD Caviar 160J

The issue I have has happened with two different types of RAM. I started out with Crucial Ballistix BL12864AA804, 2x 1GB sticks, which are on the Gigabyte website as "recommended". It was on sale then with a rebate for like $30 for a set of 2, so I got it. Then I started having stability issues running it in DDR800. I didn't know as much as I do now so I didn't really check the voltage, and ordered two more sticks (they were cheap) and put them in. Well, same issue so I figured the problem was that the voltage supplied by the motherboard wasn't enough for the 2.2V that the modules require for DDR800 performance. If I upped the voltage manually, it would top out at 2.135 volts, and then suddenly my USB keyboard wouldn't work in the CMOS. so I decided to clock them down to 667 (actually like 650 due to CPU speed) and just live with it. That was fine for 2 years.

Well, I just decided to max out my system, and am moving up to win7 64-bit from XP 32 bit, so I figured I would get more ram. I picked up 4 2GB sticks of G.Skill Ram FS-6400CL5, and threw them in. As these modules run at 1.8V for DDR800 speed, I figured my problems were over.

WRONG.

I am currently running fine in windows, but I have had to move my keyboard back to the PS/2 port as it will not function in the CMOS or on the boot menu screen when it is attached to the USB port. I have USB Keyboard and Mouse support enabled in the CMOS, so I am puzzled. If i run the ram at DDR667 I have no issues, but if I put it up to DDR800, this always happens. So far the ram seems to be stable running at DDR800, and I haven't had any hangs or reboots, but I'd really like to know what the deal is with the USB and DDR 800.
a b V Motherboard
December 18, 2010 8:16:29 PM

Crucial Ballistix is complete crap. I had a set go bad 3 times, finally I just got Corsair ram.

By the way your talking about DDR2, not DDR.

What are you using for a power supply? Make and model.
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December 18, 2010 9:23:06 PM

I was using an Antec Smartpower 500, but that started developing issues where it had to "warm up" for a minute before it would actually be able to turn on. It was at that time 5 years old, so I figured the caps were starting to go or something. It was replaced a month ago with an Antec True Power 650. I have had the same problem with both PSUs.

The ballistix yes I have heard the reviews. But I was trying at that time to stick to Gigabytes recommended memory. It was stable at the higher voltage but the USB weirdness made me under clock it down to 667.

I have checked with CPUID and the G skill ram is running at 385MHZ at 1.8V with no issues, other than the fact that the USB keyboard won't work. USB mouse seems fine.
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a b V Motherboard
December 19, 2010 1:04:36 AM

have you tried the keyboard in a different usb port?

have you tried another keyboard?
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December 19, 2010 9:16:19 PM

I don't know how it never occurred to me to plug the keyboard into a different port. I moved it down to the next group of 2, and now it works. I'll be darned. I just don't get why what speed I run my memory would have anything to do with that. the keyboard only draws 100mA from USB power.

Issue resolved I guess, though cause still unknown.
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December 20, 2010 11:28:24 AM

amd's cpus have built in memory controllers and have limitations depending on how much ram you use and how many sticks of ram you have installed. I have 4x2gig ocz fatality ddr2 1066 and a phenom ii 940. I have to run it at 800mhz because the cpu cant handle 1066 speeds when 8 gigs is installed.

odds are there isnt anything really wrong with your system, just a hardware limitation with your cpu.
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December 27, 2010 1:53:36 AM

Best answer selected by tbonesullivan.
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