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AMD x2 3800+ OC'd, need help with memory

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June 7, 2010 3:44:47 PM

Hi all

I have just upgraded my gfx card on my old AGP based system and to try to take best advantage of this card I am in the process of overclocking my system, since it is holding the new card back.

Old gfx card X1950Pro, new Gfx card HD4670.

Asus A8V, AMD X2 3800+, 2 gigs (4x512MBs) budget PC3200 RAM.

I have raised the FSB to 266MHz, but have had to reduce the HyperTransport to x3 (798MHz) (x4 won't boot) with an increase in the CPU voltage of 1.35v -> 1.5v.

My problem is with my RAM, since its budget its basically will not OC. The only memory divider that I can get it to boot on is 1:1 which CPU-Z reports as running at 133MHz. But to max my performance I want to get the memory at as close to 200MHz as i can.

The memory dividers available in the BIOS are 1:1, 4:3, 3:2, 5:3, 2:1 which based on a FSB of 266MHz should result in the memory running at 133, 177.3, 199.5, 221.6, 266. Therefore I would assume that I could use the 3:2 divider but as mentioned above only the 1:1 divider will allow me to boot.

I'm an OC'ing novice so any advice as to how I can get my memory running at a faster speed would be very much appreciated.

Thanks

More about : amd 3800 memory

June 7, 2010 3:49:05 PM

As an afterthought:

The RAM is at the default voltage and the timings are currently the default of:
CAS# latency (CL) 2.5
RAS# to CAS# delay (tRCD) 2
RAS# Precharge (tRP) 2
Cycle Time (tRAS) 5
Bank Cycle Time (tRC) 7
DRAM Idle Timer 16
Command Rate (CR) 2T

If I need to look at playing with the RAM timings this is something I'm new to so guidance would be great.
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June 8, 2010 8:17:34 PM

At the default Bios settings I would get an FSB of 200 and a memory of 166, with 10% auto overclock it would give 200 / 183, therefore from this I was able to calculate that leaving the memory settings at the default and setting the FSB to 240 would give me memory of 200.

This is a little short of the 266 FSB i managed to get previously but since the memory dividers on this board seem whack I think this is the best I can achieve.
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a b } Memory
a b K Overclocking
June 8, 2010 8:44:28 PM

Loosen the RAM timings as much as you can. Also increase the RAM voltage slightly for improved stability.
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