Try bypassing 400 and goto 425 there are some memory holes or issues at 400 - 424 and drop the NB down to 1.39 and vdimm 2.08 or 2.17
if set on unlinked, you can change both FSB and DDR speed, how u set them will determine the ratio.
if u set mem to 800 and fsb to 1600, u'll have a 1:1 ratio. if u set ddr to 810, it'll give u 405 fsb, not 202.5. and this is if u set teh qdr to 1620. if u dont care for 1:1 ratio, then just set either to your liking and let the board determine the ratio for u.
at default, the bus is 266.7 and memory is the default speed of whatever mem you have.
if u have ddr2-533, it'll run at that speed with 1:1 ratio. if u have ddr2-800 like most of us here do. it'll run at 400mhz with a 2:3 ratio, or was it 3:2, i get those mixed up.
I might be confusing this a little bit. If I run an 8 multiplier and 1600 FSB with memory at 800, it will boot into windows and freeze after 15 minutes. If I run at 8 , 1600, and 700 it will fail prime. If I run at 7 , 1880 FSB and 700 mem it runs prime 24/7. If I up the ram to 800 it will freeze.
I tried running with 1.4 NB at 8, 1600 FSB, and 700 mem. And it would post but freeze at the asus screen. It definitely needs 1.55 to run for me.
I'll try 425 on the ram but an expecting a failed post as ive tried 440 and it didnt post. I'm more perplexed that this board cant run 8x1600 FSB (3.2ghz)with same vcore and NB voltage, but can run 7 x 1880 fine (3.3ghz).
I do have DDR2 800 (PC6400). I understand about the memory at 810/2=405 405/2=202.5. 202.5X2(DDR2)X2(DualChannel)=810FSB - correct or not?
So leaving it unlinked, I should increase my FSB to ~ 810 and leave the HT alone for now?
Thanks
1700/850 =3400MHz CPU bus = 425 Ram speed = 850 / 2 Duel Channel = 425 FSB =425X4 Quad Pumped= 1700
Setting vdimm 2.08 - 2.17 vcore 1.325 - 1.35 nb 1.39 - 1.56
I recently purchased a Scythe Ninja Plus and ran into issues with the mount being obstructed by 2 capacitors. I ended up buying a $3.50 metal grinder and overcame that issue rather easily 
see link: Scythe Ninja Plus
see link: Scythe Ninja PlusOk, In all scenarios my vdimm is set to 2.08. The only thing I havent tried is bumping it higher. My ram is rated to run 1.9-2.0 at 800. Mem settings are unlinked and set to auto. Also tried 4-4-4-12-2T and 5-5-5-12-2T in the tests as well.
1.4 vcore - 1.55 NB - 8x400(1600FSB)(3.2ghz) - 350 ram speed(700mhz dual channel) - fails prime in 1 minute
1.4 vcore - 1.55 NB - 8x400(1600FSB)(3.2ghz) - 400 ram speed (800mhz dual channel) - fails prime and freezes in windows.
1.4 vcore - 1.55 NB - 7x470(1880FSB)(3.3ghz) - 350 ram speed (700mhz dual channel) - runs completely stable.
1.4 vcore - 1.55 NB - 7x470(1880FSB)(3.3ghz) - 400 ram speed(800mhz dual channel) - runs prime but freezes in windows
1.4 vcore 1.4 NB - 8x400(1600FSB) - 400 ram speed(800mhz dual channel) - freezes at asus post screen
1.4 vcore 1.4 NB - 8x400(1600FSB) - 350 ram speed(700mhz dual channel) - freezes at asus post screen
Hopefully this clarifies the problem I'm noticing, atleast with my board. I'm having a memory problem AND a multiplier problem. 8x multipler isnt stable at 400(1600FSB) but works at 7x470(1880) only if the ram is set below 350(700FSB) and northbridge at 1.55
1.4 vcore - 1.55 NB - 8x400(1600FSB)(3.2ghz) - 350 ram speed(700mhz dual channel) - fails prime in 1 minute
1.4 vcore - 1.55 NB - 8x400(1600FSB)(3.2ghz) - 400 ram speed (800mhz dual channel) - fails prime and freezes in windows.
1.4 vcore - 1.55 NB - 7x470(1880FSB)(3.3ghz) - 350 ram speed (700mhz dual channel) - runs completely stable.
1.4 vcore - 1.55 NB - 7x470(1880FSB)(3.3ghz) - 400 ram speed(800mhz dual channel) - runs prime but freezes in windows
1.4 vcore 1.4 NB - 8x400(1600FSB) - 400 ram speed(800mhz dual channel) - freezes at asus post screen
1.4 vcore 1.4 NB - 8x400(1600FSB) - 350 ram speed(700mhz dual channel) - freezes at asus post screen
Hopefully this clarifies the problem I'm noticing, atleast with my board. I'm having a memory problem AND a multiplier problem. 8x multipler isnt stable at 400(1600FSB) but works at 7x470(1880) only if the ram is set below 350(700FSB) and northbridge at 1.55
People,
The Cpu bus and the memory usally run at a 1:1 relationship. Will get into other ratio later
When you see us post something like 400x8 That means a CPU bus speed at 400 times the multiplier of your processor which in this case is 8 and that gives us a CPU speed of 3200
Now in order for your memory to run 1:1 with the CPU bus it has to equal 400 so because we are now using duel channel you always divide your speed of the ram in half so 800MHz / 2 equals 400MHz or 1:1 with the CPU bus and that is what we want here The FSB will always be four times the CPU bus speed so 400 times 4 equals 1600MHz. So we can rewrite this to read 1600/(800 in the bios/2 duel channel = 400 in windows cpuz) When you go and set your FSB/mem configurations in the bios remember this
The Cpu bus and the memory usally run at a 1:1 relationship. Will get into other ratio later
When you see us post something like 400x8 That means a CPU bus speed at 400 times the multiplier of your processor which in this case is 8 and that gives us a CPU speed of 3200
Now in order for your memory to run 1:1 with the CPU bus it has to equal 400 so because we are now using duel channel you always divide your speed of the ram in half so 800MHz / 2 equals 400MHz or 1:1 with the CPU bus and that is what we want here The FSB will always be four times the CPU bus speed so 400 times 4 equals 1600MHz. So we can rewrite this to read 1600/(800 in the bios/2 duel channel = 400 in windows cpuz) When you go and set your FSB/mem configurations in the bios remember this
I said this before stay away from 1600/800 Try 1700/850 with 2.08 or 2.17 vdimm 1.325 vcore 1.39 NB Timing should be manually set at manufactures spec's or looser so if your spec's are 4-4-4-12 2T set them at that or looser at 5-5-5-12 2T no 1T There is a BLACK HOLE for you at 1600/800
OK!
Core2, I appreciate the time you've put into this thread. But if you notice ive never run my memory at 470. Thats the CPU speed, 470 quad pumped = 1880. My ram is set to either 700 or 800 in the bios. That means its running 350x2 or 400x2.
I'm going to try inputing your recommendations, but can almost garuntee it will fail.
sorry I read your ram speed wrong. You can still try what I said first if that doesn't work try your vdimm 2.17 and NB 1.56. If you still can't get to run try 1700/700
I made a mistake I meant to write 1700/850 = mem 425 CPU bus 425 FSB 1700 CPU speed 425x8 = 3400
Originally posted by: HRPretzel
I recently purchased a Scythe Ninja Plus and ran into issues with the mount being obstructed by 2 capacitors. I ended up buying a $3.50 metal grinder and overcame that issue rather easily
Thanks, HRPretzel for letting us know and your work around.
Welcome Aboard
Sorry, for the confusion christoph83
I'm trying to watch the football game and figure out FSB equation and I kept getting Field Goals for an answers. lol
Welcome Aboard
I'm trying to watch the football game and figure out FSB equation and I kept getting Field Goals for an answers. lol
Welcome Aboard
Tnx, Core 2. I'm looking at OCing my 6600 a bit but get a little confused by all the calculations. I understand adjusting the voltages but I'm unsure about the linked or unlinked and what to set my FSB @ etc..
No Problem Core2, thanks for the advice. Running the memory at 850 in the bios appears to be working better, although I haven't had long enough testing yet.
Here is the problem I was trying to illustrate earlier though, seperate of my memory problem.
In both of these screenshots, the Vcore was set to 1.4, because it wouldnt run at anything lower, and the northbridge was set at 1.55, because neither would run properly. Thats not the problem here though.
Both screen shots are with the memory set to 850 in the bios, with 5-5-5-15-2T timings set and the rest auto.
7 multi
8 multi
As we speak the 7 multi is chugging along just fine. The 8 multi failed prime instantly and would crash or freeze within a few minutes of regular usage. Interesting thing to note is the mhz on the ram is different, but thats because the nforce is trying to find the proper divider.
So the big question is, why is the 7 multi stable and the 8 multi not?
If you look at your screen shot with the 8 multiplier your memory is running at 412.5 or 825MHz There is still a lot of problems at that area. I wanted you to try 850 / 2 = 425 in windows cpuz and 1700FSB. Your 8 multiple is fine it is the memory strap on the board thats faulty at that area Also because the bios is setting your timings at 5-5-5-15 2T write that down for reference and you should be able to manually set that in the bios and it should run fine for most of your overclocks.
try 1696 or 8 x 424. there are some problems below that i believe. should give you 3,392. nb should be able to do it at 1.3 may need a bit more vcore though.
just heard that they were pre-tested for stability at possibly lower voltages. which in theory would give me the lowest temps with the higher freq and voltage. wasn't really worth it in hindsight. an e6300 would have been about perfect. 500x7 almost a 100% OC if it could take the heat.
Core2, both of those screenshots are with bios memory speed set to 850. The nforce board took the divider and set it to 1:1 not me. Notice the 7 multi screenshot the ram is at 425? Which times 2 is 850. And I set the memory to 5-5-5-15-2T myself, everything else is set to auto.
You can see what im talking about in the bios. You may set the number to 850, but the motherboard will assign the memory a speed according to whatever the closest divider is it appears.
There is something wrong with the 8 multiplier. Atleast on my board. Give me an FSB 1600-1800 with memory set to 850 in bios and I can provide you a screenshot of prime95 failing within 1 minute.
You can see what im talking about in the bios. You may set the number to 850, but the motherboard will assign the memory a speed according to whatever the closest divider is it appears.
There is something wrong with the 8 multiplier. Atleast on my board. Give me an FSB 1600-1800 with memory set to 850 in bios and I can provide you a screenshot of prime95 failing within 1 minute.
Then you are not unlinked in the memory clock mode in the bios
It should read like this
FSB-memory clock mode: Unlinked
Memory Ratio: Grayed out with Auto showing
FSB (QDR)Mhz 1700
Actual Grayed out showing FSB
Mem (DDR,MHZ) 850
Actual Grayed out showing MEM
and make sure you press enter after your entries and arrow up to make sure it has been recorded
christoph83,
try this
memory clock unlinked
fsb(qdr) 1696
mem (ddr) mhz 800
cpu multi 8
nb 1.3 or 1.5
vcore 1.48
mem voltage auto, all mem timings auto.
let me know how that works. those are what i am currently running.
Ryan
Here, lets add another screenshot to the picture.
7 multi
8 multi
And lastly, same settings as the picture above but with a 650 setting on the memory instead of 850.
8 multi with 650 mem
adder, ill try your setup next. The problem is I havent gotten the chip stable near 3.4ghz with a 7 multi. So theres nothing for me to compare it to. While these screenshots above illustrate 3.3ghz with 8 multi and 3.3ghz with 7 multi. It's clearly a problem on my board.
7 multi
8 multi
And lastly, same settings as the picture above but with a 650 setting on the memory instead of 850.
8 multi with 650 mem
adder, ill try your setup next. The problem is I havent gotten the chip stable near 3.4ghz with a 7 multi. So theres nothing for me to compare it to. While these screenshots above illustrate 3.3ghz with 8 multi and 3.3ghz with 7 multi. It's clearly a problem on my board.
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