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Ddr2 pc2-8500 confusion

Last response: in Memory
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September 24, 2009 4:39:46 PM

I bought this ddr2 pc2-8500 a month ago. i ran cpu-z and states that i have a ddr2 6400. how do i find what i actually have? or is there something in the bios i need to change.. the sticks i took out was a ddr2 6400.

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a b } Memory
a b à CPUs
September 24, 2009 5:45:19 PM

I don't get something here,u said u bought a DDR2 PC2 8500 then u said the stick you took out was PC2 6400
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September 24, 2009 7:03:28 PM

i had ddr2 6400 800and replaced them with ddr2 8500 1066. the cpuid programs show i have the 6400 and not the 8500 i have in the computer.
after i made that post i did some research. (i have never been into this part of my computer yet.) the document for the ddr2 8500 stated the ya need to have a am2+ socket for the ddr2 8500 1066. i knew i had a am2. the cpuid say i have the am2+. i can not verify that. i didnt get that info from asus site.

i have asus m3a78-emh hdmi mobo. amd phen 9500 quad. both were installed by the shop i purchased the from so i lack the knowledge in this area and memory installation. atm the memory sticks are in the same colored slots.
if you need any other info let me know plz. thank you for your reply.
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September 24, 2009 7:18:04 PM

from cpuid

SMBus address 0x51
Memory type DDR2
Module format Regular UDIMM
Manufacturer (ID) PNY Electronics (7FBA000000000000)
Size 2048 MBytes
Max bandwidth PC2-6400 (400 MHz)
Part number
Number of banks 2
Data width 64 bits
Correction None
Nominal Voltage 1.80 Volts
EPP yes (2 profiles)
XMP no
JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency
JEDEC #1 3.0-4-4-10-29 @ 266 MHz
JEDEC #2 4.0-5-5-13-36 @ 333 MHz
JEDEC #3 5.0-5-5-15-43 @ 400 MHz
EPP timings table CL-tRCD-tRP-tRAS-tRC-CR @ frequency (voltage)
EPP profile #1 (full) 5.0-4-4-15-22-2T @ 400 MHz (1.900 Volts)
EPP profile #2 (full) 5.0-5-5-15-30-2T @ 533 MHz (2.000 Volts)
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September 24, 2009 9:11:22 PM

I did do alittle research before i bought the kit. But as i stated, I was unfamiliar with this area so what research i did was somewhat useless. One thing i did understand was not to mix 8500 with 6400.
So now I am confused. Do I have a 8500 or a 6400? Having a 800 or a 1066 dont concern me much, at least not at this time. Can i use the older memory sticks with the new?
I`m in learning mode.
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September 25, 2009 5:15:53 PM

any help here?
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a b } Memory
a b à CPUs
September 26, 2009 10:30:20 AM

According to CPU-Z u have DDR2 800 (PC2 6400)
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a b } Memory
a b à CPUs
September 26, 2009 3:15:30 PM

gnilaeh,

The info in CPUz is not correct but represents the max speed your SPD is reporting - based upon the settings in your BIOS. Get the BIOS to recognize the 1066 and CPUz will report it as such.

The first thing you need to change in your BIOS is the voltage for the DRAM. Your native voltage is 1.8V - raise that to 2.0V or 2.1V. This alone may make your memory come up as 1066.

Once you've done that and tried it, go back into the BIOS and set either the RAM speed directly, or the multiplier for RAM speed. Turn off the "auto" setting for the RAM and manually set it. Settings that weren't showing previously at 1.8V may now be available to you.

Once you get this memory working, you may want to try using all 4 modules. If you do so, it will all be set as 800. That's not bad, since the speed you gain from the extra RAM will more than make up the the slower speed. And many would argue that the RAM running at 800 with lower timings is faster anyway.

Will both pairs work together? Have to test and see. Make sure the pairs are in their own color slots. Both new ones in one color, both old in the other color slots.
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