Originally posted by: Javvis
Per request ...the following are the Voltages on the Asrock 775 VSTA Board:
agp "high" 1.59v
agp "low" 1.54v
--------------------
DDR "high" 2.73v
DDR "norm"2.63v
DDR "low 2.53v
--------------------
DDR2 "high" 2.0v
DDR2 "norm" 1.9v
DDR2 "low" 1.8v
Now back to my previous post question: I've purchased several of these Asrock 775 VSTA boards & recently built a system as listed below:
1.) 3.0 ghz Cedar Mill.
2.) 2 sticks 256mb Geil 3500 DDR memory sticks .
3.) AGP Card.
I set the FSB to 233 & the memory to 200 ...& it booted up at 3500 mhz without any increase in processor (30 C) temp.
I noticed while using the newest version of Everest ...that my Memory was running at 217 mhz & the memory/FSB divider was 6/8. I've always thought that it's better to run 1:1 or possibly 1:2. (Flexibility option is turned off)
Could someone please explain this memory/FSB divider thing for this board in detail using my setup with DDR & also if I switched to DDR2. I would like to run at 1:1 ...how would I do this ? I've looked elsewhere & could only find minimal info regarding this.
I've got a new 6300 CD2 ...but, I think the 4300 or upcoming 4400 would work better on this board because these CPU's have lower FSB (200 vs. 266) & higher multiplier.
I have come across this explanation by Slipstreem in regards to ram dividers. I'm sure I have posted it here in this forum somewhere before, hope this helps.
Quote
Hi peeps!
I've noticed that quite a few people who are relatively new to overclocking seem to be having trouble setting their DDR memory up correctly on this motherboard.
The following may be helpful to someone...
You cannot lock the memory speed on this motherboard, but you can manually change the divider to bring the memory speed back down when you overclock.
The dividers aren't expressed as dividers in the BIOS. They are expressed as DDR speeds which can be a little confusing.
I'll try to explain:
At 200MHz FSB (quad-pumped 800MHz for an E4300), the motherboard will give the following memory speeds for its stated 'DDR' speeds when used with DDR memory...
'DDR400' = 1:1 = 200MHz = DDR400,
'DDR333' = 6:5 = 166.7MHz = DDR333,
'DDR266' = 3:2 = 133.3MHz = DDR266.
These dividers hold true until the we reach an FSB of 240MHz where a new set of dividers are invoked as shown below. Now, suppose that we take the FSB straight up to the level that most unmodified Dual-VSTA motherboards will reach. This seems to be around 290MHz. The dividers and memory speeds will then be as follows...
'DDR400' = 4:3 = 217.5MHz = DDR435,
'DDR333' = 8:5 = 181.25MHz = DDR362.5,
'DDR266' = 2:1 = 145MHz = DDR290.
These new dividers make perfect sense when you consider that at an FSB of 266MHz, the memory speeds are actually DDR400, DDR333 and DDR266 again. This gives the correct memory speeds for processors running at a quad-pumped speed of 1066MHz, ie, the E6300, etc.
So, we don't have precise control over the memory speed achieved for a given FSB, but we can predict what it will be and select the appropriate 'DDR' setting in the BIOS for a given FSB.
Good DDR memory with slackened timings should manage at 290MHz FSB on the new dividers. If it doesn't, then knock the setting in the BIOS down to the 'DDR' setting below the one that matches your memory's actual DDR speed and try tighter timings to compensate for the underclock.
I hope this makes sense.
Cheers, Slipstreem.