Barton Core Question

March 8, 2009 at 14:51:35
Specs: Windows XP, 2800+ Barton
I recently obtained a free Barton 2800+ (AXDA2800DKV4C)--266 FSB model. Now, I know the Barton is capable of a running at a 400 FSB (effective). My motherboard is as well. My question is this: In theory, if I had PC3200 RAM, could I run this chip at 400 FSB? I have the C version (266 FSB), but should this even make a difference? Aren't all Barton Cores capable of 400 regardless of being a C,D, or E? Currently, I'm running the chip at 13 X 166 (completely stable, idles @ 34C/low 40's load)--bios even identifies it as a 3000+. I was able to go a bit higher--13.5 x 166, but pushing it to 14 X 166 is too much--even with a voltage increase to 1.725. Perhaps i should up the voltage higher? Any overclocking advice would be appreciated.

Since I only have PC2700 right now, I know I will never be able to push the FSB to 200 mhz (tried that already). Furthermore, pouring more money into this system would not be a wise decision given its age. So, in theory, if I had PC3200, could it be done? Thanks

Athlon XP 2800+ ( paired with a Thermalright SLK-800 and TT Smart Fan).
Shuttle AN35N Ultra 400
Enermax 350W (26A on 12V)
2 GB PC2700

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March 8, 2009 at 19:50:48
Since you only have PC2700, there's no point even attempting running the CPU frequency at 200MHz (400MHz FSB). With any socket A system, it's important to keep the CPU:RAM ratio at 1:1, so you're gonna have to keep the CPU freq within reason of what the RAM can handle. With PC2700, somewhere between 175-185MHz will be about it. The faster the FSB, the faster the system, so if you have to sacrifice a little CPU clock speed to be able to run a higher FSB, so be it. You should be shooting for approx 2.20-2.40GHz.

I have one of these boards so here's how I recommend you do it....

Under Advanced Chipset Features:

System Performance = Expert
FSB Frequency = 175MHz
CPU Interface = Optimal
Memory Frequency = 100%
Memory Timings = Expert
T(RAS) = 11
T(RCD) = 3
T(RP) = 3
CAS Latency = 2.5
FSB Spread Spectrum = Disabled
AGP Spread Spectrum = Disabled
AGP Aperture Size (MB) = 128MB

Under CPU Ratio/Voltage Control:

CPU Ratio Select = 12.0x
CPU Voltage Select = 1.700v
RAM Voltage Select = 2.6v (if default is 2.5v); 2.7v (if default is 2.6v)

The above settings will run the CPU at 2.1GHz with a CPU:RAM freq ratio of 1:1. Both will be running at 175MHz (350MHz FSB/350MHz DDR). That's a decent starting point. Leave the CPU multiplier at 12.0x & began increasing the CPU freq a few MHz at a's all trial & error from here on out. You *may* have to increase the CPU voltage even more to stablize the overclock. See if you can get the CPU freq up to 185MHz...that will put the CPU at 2.22GHz. If you can pull that off & wanna go for more, try raising the CPU multi to 12.5x.

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March 8, 2009 at 20:01:24
Thanks for all the info Jam, much appreciated.

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