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- 24 Dec 2011
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i forget to mention another problem last night about how i cant put 102.9 in the base clock, i can only set it to a full number and not a decimal so i set it to 102, i dont know why though :/
I7 3820 overclock
- Thread starter MrPcGamer93
- Start date
bclk overclocking by even one or two mhz seems to not work with my gigabyte board I could only get 4.75ghz and I had background feelings that it wasn't always perfect like occasionally a hang here or there after hours of usage so I took it down to 4.5ghz. I think you could start by seeing if you have the basics by setting the turbo cores to the same multi as the main multi and disable the power saving modes then put the volts to 1.45 and work down from there. Just set the strap to 1.25 and then boot and see if that works first.
Thats strange considering MSI boast so much about how good base clock tweaking is on the BBXII 
I can set to one decimal place on the UD7.
May need to start at 102 and then later down the line to 103. 102 x 1.25 x 18.66 will put the memory around 2380mhz, with 103 around 2403mhz. You could even stick with a 100 base on 1.25 strap to give 2333mhz. 2403mhz should be easily done with little tweaking.
I can set to one decimal place on the UD7.
May need to start at 102 and then later down the line to 103. 102 x 1.25 x 18.66 will put the memory around 2380mhz, with 103 around 2403mhz. You could even stick with a 100 base on 1.25 strap to give 2333mhz. 2403mhz should be easily done with little tweaking.
- Joined
- 24 Dec 2011
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I think you guys will be pleased to know ive overclocked to 4.32ghz.
**** YEAH!!!!!!
thankyou you guys for all the help.
PGI947, i used your settings but changed them slightly and it worked,im getting temps of around 36-42 at idle and i ran prime95 for a quick hour and the max temp was 65degrees.
one more question i do have though is that when im just idleing watching youtube videos and web surfing, cpu-z says that its going at max speed, because before overclocking it would drop to 1200mhz when idling.
**** YEAH!!!!!!
thankyou you guys for all the help.
PGI947, i used your settings but changed them slightly and it worked,im getting temps of around 36-42 at idle and i ran prime95 for a quick hour and the max temp was 65degrees.
one more question i do have though is that when im just idleing watching youtube videos and web surfing, cpu-z says that its going at max speed, because before overclocking it would drop to 1200mhz when idling.
Can I just ask... I've got my 3920 on a EVGA X79 SLi at BCLK 106mhz x43.
What's this strap thing people are on about?I have a BCLK ratio which has 1.25 in it, so if I set this... what happens... not understanding above posts... I have 1600mhz memory so if I set the memory to 1333, have a BCLK at 100mhz and set ratio to 1.25 then what is my base BCLK running at then? Also, does this upset all the LAN/GPU controller as if I go to 107mhz BCLK the system fails, it's running 100% at 106mhzx43.
What's this strap thing people are on about?I have a BCLK ratio which has 1.25 in it, so if I set this... what happens... not understanding above posts... I have 1600mhz memory so if I set the memory to 1333, have a BCLK at 100mhz and set ratio to 1.25 then what is my base BCLK running at then? Also, does this upset all the LAN/GPU controller as if I go to 107mhz BCLK the system fails, it's running 100% at 106mhzx43.
Right, went in, set ratio to 1.25 and set BCLK to 1.06.25mhz is showed... no goer... it's likes running at 1.06BCLK but increase it slightly (BIOS states 106BCLK but CPUZ says it's actually 105.7mhz)... so it's like it's 0.5mhz too high... anyone got any suggestions... as temps are well cool...
The 'strap' can also be known as the BCLK ratio or in my case the 'gear ratio'. It acts as a multiplier for the actual base clock.
So a 100mhz (standard) BCLK with a strap/ratio of 1.25 will give you an effective BCLK of 125mhz.
This effective BCLK also has an effect on your memory speed, as from stock your memory for 1600mhz is calculated as so:
100mhz (BCLK) x 16 (memory) = 1600mhz
When you start using the strap/ratio it becomes:
125mhz (effective) x 16 (memory) = 2000mhz
So you need to drop the memory rating/multiplier down to suit your memory, so with a 100mhz base, 1.25 ratio and aiming for 1600mhz memory you'd be looking at something like:
125mhz (effective) x 13.33 (memory, or 1333mhz) = 1666mhz
Pushing the actual BCLK (that is at 100) too high can cause instabilities, the strap/ratio will also multiply from the actual BCLK you set too, so IF:
101mhz (BCLK) x 1.25 (strap/ratio) = 126.25mhz (effective)
You shouldn't need to push the actual BCLK too high. You'll also want some decent memory (some 2133mhz rated would be a start) as some memory doesn't like getting pushed too high with the higher effective BCLK. I had to move to a 2400mhz kit from my 1600mhz kit as the 1600mhz stuff simply couldn't cope with anything above 1666mhz.
So a 100mhz (standard) BCLK with a strap/ratio of 1.25 will give you an effective BCLK of 125mhz.
This effective BCLK also has an effect on your memory speed, as from stock your memory for 1600mhz is calculated as so:
100mhz (BCLK) x 16 (memory) = 1600mhz
When you start using the strap/ratio it becomes:
125mhz (effective) x 16 (memory) = 2000mhz
So you need to drop the memory rating/multiplier down to suit your memory, so with a 100mhz base, 1.25 ratio and aiming for 1600mhz memory you'd be looking at something like:
125mhz (effective) x 13.33 (memory, or 1333mhz) = 1666mhz
Pushing the actual BCLK (that is at 100) too high can cause instabilities, the strap/ratio will also multiply from the actual BCLK you set too, so IF:
101mhz (BCLK) x 1.25 (strap/ratio) = 126.25mhz (effective)
You shouldn't need to push the actual BCLK too high. You'll also want some decent memory (some 2133mhz rated would be a start) as some memory doesn't like getting pushed too high with the higher effective BCLK. I had to move to a 2400mhz kit from my 1600mhz kit as the 1600mhz stuff simply couldn't cope with anything above 1666mhz.
Right, well my memory is running 1692mhz 100% stable as I've currently got:
106BCLK which is actually 105.7mhz in CPUZ...
So, it's, 105.7 (BCLK) x 1600 (memory) = 1691.6mhz with the CPU reading 4546mhz... prime stable 100%.
So I know the memory can hold a higher speed than it's factory set... so what I did was set the BIOS to:
BCLK (106.25mhz as this is the lowest I can have with the ratio set to 1.25)... and set the multi low like 36 or 37... and the memory at 1333...
So the CPU could only be running at 3825mhz at these settings and the memory at 1416mhz and it wouldn't boot, just sits there with blank screen...
Thinking it's the BCLK literally just won't got that extra 0.5mhz higher Gutting as I think this CPU has got loads in it...
106BCLK which is actually 105.7mhz in CPUZ...
So, it's, 105.7 (BCLK) x 1600 (memory) = 1691.6mhz with the CPU reading 4546mhz... prime stable 100%.
So I know the memory can hold a higher speed than it's factory set... so what I did was set the BIOS to:
BCLK (106.25mhz as this is the lowest I can have with the ratio set to 1.25)... and set the multi low like 36 or 37... and the memory at 1333...
So the CPU could only be running at 3825mhz at these settings and the memory at 1416mhz and it wouldn't boot, just sits there with blank screen...
Thinking it's the BCLK literally just won't got that extra 0.5mhz higher
Gutting as I think this CPU has got loads in it...The reason it won't boot with 106.25 x 1.25 x 13.33 is that you have an effective BCLK of 132.81mhz, paired with a 13.33x (1333mhz) memory multiplier gives ~1770mhz on the memory, which your memory may not be able to handle.
If using the strap/ratio LOWER the BCLK from 106, you shouldn't really need to go above 103.
If using the strap/ratio LOWER the BCLK from 106, you shouldn't really need to go above 103.
Ahhhhhh... right... ok... well I have a problem then as the lowest BCLK I can go with the ratio set to 1.25 is 106.25mhz, it won't show the option to go lower... the only way I can go lower is just have the ratio set to 1.00 and set the BCLK to 106mhz...
So, if I lower my memory to 1077mhz think the lowest option is, then if I try at 106.25x1.25x10.77 gives 1430mhz on the memory then.. so if this fails then it just means I've topped out on the BCLK?
So, if I lower my memory to 1077mhz think the lowest option is, then if I try at 106.25x1.25x10.77 gives 1430mhz on the memory then.. so if this fails then it just means I've topped out on the BCLK?
Possibly, but you have to remember as well that dropping the memory speed so low negates the point of the CPU OC, which was why I went for a 2400mhz kit, as under-clocking the memory wouldn't take much if any effet on the overall system performance.
Its a complicated chip to OC (out of the current crop anyhow), reminds me of tweaking FSB on 775
Its a complicated chip to OC (out of the current crop anyhow), reminds me of tweaking FSB on 775
Well, set memory to 1066 or whatever it was and nothing, refused to budge... I think that the board is just sticking to it's guns and won't go above 106mhz Gutting really as I think the chip out classes the board somewhat really as I got this one cheap.
Gutting really as I think the chip out classes the board somewhat really as I got this one cheap.
That's the thing though, with the 1.25 strap/ratio, the only BCLK options start at 106.25mhz... right upto go knows what... so I can't select a 1.25 strap and a lower than 106.25mhz BCLK.... so I'm knackered... so I have to have the strap set to 1.00 and the BCLK set to 106mhz and 43 multi, this is the only way I can get a good overclock... if I go strap of 1.25 I can only have 106.25mhz and the system just locks at boot.
Wait... what?
Have you updated the BIOS to the latest? Because that just sounds weird..
YEP, running BIOS No.39 lol... latest one from EVGA. It starts at 106.25mhz then goes up and up... then there's a 1.65 strap is it and a 2.50 strap etc... and each one of them starts where the lower strap stops... I was hoping you could say put a manual over so set the strap to 1.25 and set the BCLK to say 103 or even stick at 100mhz... but it won't allow it, it's a pre-defined list of BCLK speeds.
But yeah... with a 1.25 strap I can't go lower than a 106.25 BCLK. Think it goes 106.25, 107.25 etc etc
Have you tried to enter it manually rather than clicking options? I.e. type 100.00 and press enter?
It does sound messed up and full of fail on EVGA's part, I'd be asking EVGA support what the deal is with that, the bclk should be adjustable from around 88 to 130.
It does sound messed up and full of fail on EVGA's part, I'd be asking EVGA support what the deal is with that, the bclk should be adjustable from around 88 to 130.