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Athlon II X4 640 and DDR2 800

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March 17, 2011 8:30:44 PM

Can an Athlon II X4 640 run with DDR2 800, or does it require faster memory? My motherboard is the Asus M4A785-M with the AMD785g chipset.

I'm having trouble getting XP to recognize all four cores, and I'm wondering if the CPU/memory combination is the problem.

More about : athlon 640 ddr2 800

March 17, 2011 9:22:29 PM

rolli59 said:
If the board supports the CPU it should not be a problem. Do you have the required BIOS for that CPU? http://usa.asus.com/product.aspx?P_ID=ef0qgvMIwOUagAVl


Thanks. I flashed to the latest BIOS (version 1006) without any luck. Maybe I should downgrade to the BIOS version they mention for the CPU, although you would think it would be supported in the latest version if it is supported at all.
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a c 850 à CPUs
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March 17, 2011 9:24:48 PM

Latest BIOS includes all fixes from older so no need to go back. Did you install XP with that CPU?
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a b à CPUs
a c 78 V Motherboard
a b } Memory
March 18, 2011 1:20:03 AM

RAM type, size, or speed won't affect how many cores are seen.....

How do you know XP doesn't recognize all the cores? JUST hit CTRL-ALT-DEL; then start up the task manager and hit the Performance tab. There will be a separate graph for each CPU core under CPU Usage History....

OR, download & install CPU-Z and it will tell you how many "cores" on the CPU tab.....
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March 18, 2011 1:20:50 AM

Athlon II X4 has memory controller for DDR2 and DDR3. It will come down to motherboard support.
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March 18, 2011 5:29:15 AM

Thanks for all the answers and suggestions. My overall problem is that when I install XP Pro SP3 with APIC enabled in BIOS, I always get a BSOD (No_More_IRP_Stack_Locations) after the first reboot. If I turn off APIC then XP will finish installation. However, no APIC means no multi-core and I get the Standard PC HAL (I've tried forcing the APCI Multiprocessor and even the MPS Multiprocessor HALS, but no luck). There is only one core present in Task Manager.

I don't think this is due to any faulty hardware. I can run Ubuntu from a LiveCD with no problems and with all 4 cores running. I've also done an overnight Memtest with no errors. There just seems to be a communication issue between XP and the BIOS. I've tried tweaking all kinds of BIOS settings (and I must have been through at least a dozen XP install attempts), but the only thing that gives me a successful install is with APIC disabled.

Dadiggle, I'll try the 1.8V settings on my RAM. I've saved tweaking the voltages for the last resort. I know it is pretty safe, but I'm always afraid I'm going to fry a component.
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March 18, 2011 5:34:01 AM

I've got an old Sempron (I actually had it in this board briefly, so I know it works). Maybe I can do an end-run around the XP install. I'll install XP with the Sempron and get all my drivers installed. Then, I'll swap the Sempron with the Athlon II X4. If I cross my fingers, maybe XP will recognize the hardware change and give me the APCI Multiprocessor HAL.

Any thoughts on this approach?
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March 18, 2011 8:39:10 AM

Yes, Just Check My Machine Specs, Im Running A Phenom II On An AM3 With 6GB DDR-2 CAS4
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May 3, 2011 7:06:58 PM

Quote:
you mean AM2+ and not AM3.
FYI.




to let you know i had an m4a785-m asus board and it was AM3 with ddr2 any AM3 board should also hold an AM2+ processor weather ddr2 or ddr3
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