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I recently purchased an Athlon XP 2800 for $15, and I'd like to use it in my older backup machine.
The motherboard is an Asus A7V8X, and there's a sticker right on it that says "333MHz FSB Support"The CPU is a Barton XP 2800+, 2083MHz, 333MHz FSB, and 512KB L2.
The board was working just fine with an XP1600+ processor and 1GB of DDR400.
When I put the 2800+ in, the BIOS tells me that "due to external CPU frequency, DRAM must operate at 333MHz or higher."
Doesn't make sense to me, since I'm using 400MHz PC3200. I tried testing it with a 333MHz PC2700 stick, but got the same message. I'm using the latest BIOS revision, and Asus clearly says that my board supports the 2800+ Barton. What am I doing wrong?
You have to setup the BIOS accordingly. These are the important ones:
Under Advanced Menu:
CPU speed = manual
CPU freq multi = 12.5x
CPU ext freq = 166/33
Memory freq = 333
CPU vcore setting = manual
CPU vcore = 1.65vUnder Chip Config:
Graphics aperture size = 128MB
Under Boot Menu:
Plug & play O/S = NO
Rest config data = YES
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That's exactly how the BIOS is setup right now, but it still gives me the error.
The only way it will let me boot is if I underclock the CPU to 1.67GHz.
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According to CPU-Z, it's definitely a Barton 2800+.
This CPU ran fine on the testbed at the local computer shop from which I purchased it.
From what I can gather from the BIOS message: "...DRAM must operate at 333MHz or higher," I'm guessing that it thinks the RAM isn't fast enough for the new CPU (which of course, at 400MHz, it is).
Or am I completely off?
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Since you have a 333MHz (166MHz) CPU, running your DDR400 RAM as DDR333 (166MHz) would be optimal.
Double check your memory freq setting in the BIOS. It states right in your manual that you can NOT run the RAM at DDR266 with a 333MHz CPU.
EDIT: just for the heck of it, try changing the memory freq setting to AUTO
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I've tried all three settings: 333MHz, 400MHz, and AUTO. It still gives me that message.
Is there any way to force it to boot Windows, even though it thinks there's a problem? I believe I saw a "Halt on all errors" option in there, but I'll have to wait till I get home to make sure I'm not making things up. :)
Could this be the reason it's, well...halting on what it thinks is an error?
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I guess it would be worth a shot.
Another thing you should confirm is that ALL your RAM is DDR400.
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Well, my Halt on Errors idea didn't do anything helpful.
All of the memory (it's a single 1024MB stick) is DDR400.
Would the CAS/RAS DRAM settings have anything to do with this problem (there are quite a few settings in there)?
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I've got a dumb question for you. After you receive the message, "due to external CPU frequency, DRAM must operate at 333MHz or higher", what happens? Does the system lock up? or will it continue to boot into Windows?
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Have you try to update your BIOS to the latest version? Maybe that will fix the error message...
TMP-Man
Asus P5P800 PAT
P4 506 @ 4009Mhz 1.3v
Thermaltake CLP0024 w/ 1700RPM 92MM + AS5
2GB OCZ 2-3-2-5 DDR400
120GB/300GB 7200RPM HD
Leadtek 7600 AGP 590/1600 VF700 ALCU AS5
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jam: After displaying that message, it dumps me to the BIOS and lets me fool around in there. It never locks up, but it also never lets me into Windows, because when I exit the BIOS and reboot, it does the same thing all over again.
TMP-Man: Yes, I'm using the latest BIOS revision. I even tried five of the different earlier versions.
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