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CMX512-3200PT not running @ full speeds on Asus A7N8X Deluxe...


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RAM : Corsair XMS 512MB PC3200 'CMX512-3200PT' v2.1


Motherboard : Asus A7N8X Deluxe Rev 2.00


CPU : AMD Athlon XP 2500+ "Barton"


Video Card : ATI Radeon 9700 Pro



Problem : Default speed is 166 MHz (PC2700) and I cannot run it at 200 MHz (PC3200). I tried upping the voltage, setting it to SPD then 3-3-3-8, setting to aggressive, setting ram performance to 100%, and everytime i reboot to check if it works; I can hear the computer working but I get a black screen. I then have to RESET CMOS battery and boot up again.


Can someone help?

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  • Corsair Employees

I am sorry but this is a chipset limitation.

If the FSB of your CPU is 400 For Intel and 100 MHz for AMD, the memory speed supports only DDR 266.

If the FSB of your CPU is 533 For Intel and 133/166 MHz for AMD, the memory speed supports DDR 266/333

If the FSB of your CPU is 800 MHz for Intel and 200 MHz for AMD, the memory speed supports DDR 333/400

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  • 4 months later...
Also, your problem is more likely the fact that you're trying to overclock your AMD Athlon 2500+ to run at a Athlon 3200+ speeds. Your CPU is probably not able to handle it. While SOME 2500's are able to run at that speed, there are many settings and preparations needed to get your system to run stable at that speed... ie. CPU Voltage increases, and VERY good cooling for your CPU to handle the higher voltage.. Increasing your FSB higher than your CPU is rated requires more voltage.. which creates more heat.. which creates instability. Try a less agressive overclock.. perhaps 166fsb or 183...
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My old system was an nforce2 mainboard with xp2500 'Barton' @ 3200, with 2x512MB Corsair Value Select.


CPU = 11*200fsb (1.7Vcore - set to auto in BIOS)

Mem = 200MHz Dual Channel (middle slot empty!!) 8-3-3-2.5 (2.8Vdimm - set to auto in BIOS)


The system ran rock solid stable for 8months with an x800xt, until I upgraded.


You have rev 2.0 ASUS A7N8X Deluxe, which will run 400fsb!

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I have the A7N8X-E Deluxe which is a similiar board with a gig of PC3200 C2 platinums. I also have a Barton 2500, but the mobile instead of the desktop. I had luck with 11-2-2-2 ram timings with 2.9vdimm. You may want to Google for the Trats BIOS and update your BIOS. You may also want to consider selling that Barton and going for the mobile as they are very overclock friendly. Currently I am running @ 2.6Ghz with 1.825 volts. This is idling @ 38c and about 42c under load ON AIR!!! This is an 800mhz overclock (eat that Intel!)


The biggest thing I noticed was with my motherboard, if you are going to overclock your ram, start at a low multiplier, like 10, or 10.5. Start increasing the FSB 1 to 2 mhz at a time until you reach instability, then back of a couple. After this, try upping your multi. When I tried overclocking my ram with a 12x multi, I couldn't even get 4mhz over 400fsb without BSOD. Once I backed off, I was able to get (and am still at) 236mhz which is 472fsb! This coupled with an 11.0 multi equates to pure Barton Bliss!


P.S. Google for A7N8X Bios and A7N8X Ram Timings, you'll find some good forums packed with some valuable info!


Good luck!

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The XP2500 'Barton' is a good overclocker, the fact that most manufactured during last year are multiplier locked means you can only adjust the fsb, and they will do 200MHz fsb on an nforce2 mainboard capable of running that speed, which the Asus A7N8X Deluxe Rev 2.00 is!


I had the EPoX 8RDA+, and my friend had the Asus A7N8X Deluxe, both would run an XP2500 @ 11*200fsb.


My voltages were - 1.7Vcore, 2.8Vdimm, also try your memory timings @ 8-3-3-2.5.


http://compreviews.about.com/od/cpus/l/aaAthlonXP2500.htm <<--Using A7N8X


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