Which would you get ?

[Johnny Grenade]

Ahh, this all makes sense. This is exactly what I am seeing then. Thanks for all the screenies and the PCMark runs. A couple things that are still puzzling. Take a look at chipset 3.

Logical/Chipset 3 Memory Banks
Bank 0 : 512MB DDR-SDRAM 2.5-3-3-8 (tCL-tRCD-tRP-tRAS) CR2
Bank 1 : 512MB DDR-SDRAM 2.5-3-3-8 (tCL-tRCD-tRP-tRAS) CR2
Bank 2 : 512MB DDR-SDRAM 2.5-3-3-8 (tCL-tRCD-tRP-tRAS) CR2
Channels : 1
Speed : 2x 200MHz (400MHz data rate)
Width : 128-bit
Memory Controller in Processor : Yes
Cores per Memory Controller : 2 Unit(s)
Maximum Memory Bus Bandwidth : 6400MB/s (estimated)


Says Channels 1 ?? Could this be a sandra bug?
Also from PCWizzard look at this..


Memory Controller Information :
Memory Controller : SIMM, DIMM, SDRAM
Number of connectors : 4
Max. Module Size : 1024 MB
Max. Memory Size : 4096 MB
Supported Speed : 70ns, 60ns
Supported Voltages : 3.3v
Error Detection Method : 64-bit ECC
Error Correction Capability : Unspecified
Current/Supported Interleave : 1-way/1-way


Current supported Interleave = 1 way ?

This should be dual bank interleave I would think. That is why I thougt the chipset is not initializing properly with both banks populated. The bus effieciency is less than 70 percent as well. Maybe the boys over at HCP could shed some light on what the supported interleave is on the ULI chipset and why the 1 channel thing comes up in sandra.

[unisol]

What does CPU-Z say? Look on the memory tab at the upper right side.

[unisol]

Here is what Sandra says about mine:

Logical/Chipset 3 Memory Banks
Bank 0 : 1GB DDR-SDRAM 3.0-4-4-9 (tCL-tRCD-tRP-tRAS) CR2
Bank 1 : 1GB DDR-SDRAM 3.0-4-4-9 (tCL-tRCD-tRP-tRAS) CR2
Channels : 1
Bank Interleave : 2-way
Speed : 2x 235MHz (470MHz data rate)
Multiplier : 1/11x
Width : 128-bit
Memory Controller in Processor : Yes
Cores per Memory Controller : 2 Unit(s)
Refresh Rate : 7.80µs
Power Save Mode : No
Fixed Hole Present : No


..not sure where you saw that exact info in Sandra..this is from the Motherboard info screen.


From PCMark on mine...same thing:
Memory Controller : SIMM, DIMM, SDRAM
Number of connectors : 4
Max. Module Size : 1024 MB
Max. Memory Size : 4096 MB
Supported Speed : 70ns, 60ns
Supported Voltages : 3.3v
Error Detection Method : 64-bit ECC
Error Correction Capability : Unspecified
Current/Supported Interleave : 1-way/1-way

[Johnny Grenade]

CPU-Z says dual channel , but bank interleave is blank
Also notice in *your* sandra dump it says bank interleave is 2 way. I dont have that message. My system is not bank interleaving. When you run that overall memory benchmark (PCWizzard MEM )I bet you get performance > 3.2GB per sec. Mine doesnt.

Rule for this motherboard has to be: you need identical size memory in all slots for optimum performance.

[unisol]

Found a little tidbit of info for you on tRAS. You have it at 8, it should be 9, 10, or 11.

www.anandtech.com/mb/showdoc.aspx?i=2471&p=5

I can't find sheet on the interleaving. But I did download Everest Home Edition and it clarifies what chipset #3 is...its not the motherboard, but instead the IMC on the A64.
You can download it here: www.majorgeeks.com/download4181.html

[unisol]

I hit 2.8Ghz after doing the volt mod to feed my CPU 1.55v.

damnocracygaming.com/e107_plugins/forum/forum_viewtopic.php?4094

[Johnny Grenade]

Thats awesome performance. Probably hitting the limits of the power supply circuitry on the board. If you hear buzzing, thats most likely the inductors saturating due to too much current being pulled through them. Power to the board will not be filtered properly and transients will get through to sensitive components. Thats probably why its not stable.

[unisol]

Well, I got it stable at 2.75Ghz with my RAM at 250Mhz. I have had it running for a couple of days now at that speed and not a crash.

The buzzing..it's not doing it now so I keep my fingers crossed.