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How overclock 980x memory?

post #1 of 11
Thread Starter 
I have a 980x over clocked to 4.4Gghz. Actually was a lot higher stable but like to drop it a bit for memory increasing and everyday use. I have a Rampage III Extreme motherboard and 2000mhz rated memory. My overclock is at 33x multiplier and 134 BCLK. The DRAM Frequency is offering like 1866 and 2133mhz. And some others slower and faster options. Do I have to keep upping the BCLK to get the memory closer to its rated speed to test it or is there some other setting for the memory I'm missing?

Thanks

JR
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post #2 of 11
Yea set the BCLK to 143 (on the 1866 divider will land you at ~2002 mhz) and then change the CPU multiplier as necessary.
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post #3 of 11
Quote:
Originally Posted by Dopamin3 View Post
Yea set the BCLK to 143 (on the 1866 divider will land you at ~2002 mhz) and then change the CPU multiplier as necessary.
that ^ x10000
post #4 of 11
You can do 200*22 @ 1.4v and QPI at 1.25, make sure ram runs at whatever the manufacturer wants them to run and that timings are correct.
post #5 of 11
Thread Starter 
Quote:
Originally Posted by wint0nic View Post
You can do 200*22 @ 1.4v and QPI at 1.25, make sure ram runs at whatever the manufacturer wants them to run and that timings are correct.
Thanks for the replies. Makes sense. Dumb question maybe and sorry if this deviates slightly from the memory. So I have 134*33 coming out at 4422MHz. At 200*22 I would be at 4400MHz. Excluding the 22MHz difference, would being stable at 134*33 automatically make me stable at 200*22? Strictly talking on the processor side. Trying to see if I have to retest the processor stability with loose mem clocks before testing the memory and overall stability.

For reference I always like to test the CPU only (as much as possible) then the memory and then do a prime blend test for overall stability before going live with a system.

Thanks
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post #6 of 11
Quote:
Originally Posted by jriker1 View Post
Thanks for the replies. Makes sense. Dumb question maybe and sorry if this deviates slightly from the memory. So I have 134*33 coming out at 4422MHz. At 200*22 I would be at 4400MHz. Excluding the 22MHz difference, would being stable at 134*33 automatically make me stable at 200*22? Strictly talking on the processor side. Trying to see if I have to retest the processor stability with loose mem clocks before testing the memory and overall stability.

For reference I always like to test the CPU only (as much as possible) then the memory and then do a prime blend test for overall stability before going live with a system.

Thanks
You might not necessarily be stable. It could go either way. You are increasing the Uncore frequency a little bit, same with QPI Link and also the 22mhz difference. Plus you never know, the same OCs on different multis may need slightly different voltage. I know Bloomfield didn't like even multipliers and OCed better on odd ones, I'm not sure if this is the case on Gulftown as well.
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post #7 of 11
Thread Starter 
Quote:
Originally Posted by Dopamin3 View Post
You might not necessarily be stable. It could go either way. You are increasing the Uncore frequency a little bit, same with QPI Link and also the 22mhz difference. Plus you never know, the same OCs on different multis may need slightly different voltage. I know Bloomfield didn't like even multipliers and OCed better on odd ones, I'm not sure if this is the case on Gulftown as well.
Mine was very odd. I was able to get to 4.4GHz on crazy low volts, 1.26v stable with prime for 33 hours before I stopped it. Then to get to 4.5 has to jump to 1.35V which was still low but was getting uncomfortable for daily use on the temps and quite a volt jump for 100MHz.

Wint0nic said to go with 200*22. Any reason to do this to get around 2000MHz on the memory over doing 143*31 and hitting about the same mem speed? Is it that some prefer tweaking BCLK since that's standard for most chips other than the extreme ones or is there a good reason to up the BCLK over the multiplier?

Thanks

JR
Edited by jriker1 - 10/9/11 at 10:31am
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post #8 of 11
Quote:
Originally Posted by jriker1 View Post
Mine was very odd. I was able to get to 4.4GHz on crazy low volts, 1.26v stable with prime for 33 hours before I stopped it. Then to get to 4.5 has to jump to 1.35V which was still low but was getting uncomfortable for daily use on the temps and quite a volt jump for 100MHz.

Wint0nic said to go with 200*22. Any reason to do this to get around 200MHz on the memory over doing 143*31 and hitting about the same mem speed? Is it that some prefer tweaking BCLK since that's standard for most chips other than the extreme ones or is there a good reason to up the BCLK over the multiplier?

Thanks

JR
It's up to you. When I had my 920 I was obviously stuck on a max of 21 multiplier and I had no problem running BCLK at 200 24/7 on various boards. Just keep in mind when increasing the BCLK, you're also increasing the QPI Link frequency, CPU uncore frequency (and obviously memory frequency). These things don't really add a ton to performance, but they will require additional tweaking like probably vcore and CPU VTT/QPI DRAM/QPI VTT voltage depending on what the board calls it.
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post #9 of 11
Thread Starter 
Looks like contrary to what i have read in the past, upping the BCLK takes more cpu voltage than upping the multiplier. 34*134 setting stable for 33 hours in prime at 1.26v causes a reboot after 4 hours at 31*142 at 1.26v. I have the memory at 1.65v so not sure if the QPI needs raising with the increase in memory speed even though its slightly under its rated speed (1996mhz). QPI Is 1.3125v.

Note: entire overclock process have tight timings on the memory (7-7-7-21) however thats what its rated at at 2000mhz. I am rerrunning again with the memory set to 177something to see if it reboots again. At that speed wouldnt think the memory would factor in as i was testign at 1886mhz thru 4.5ghz successfully.

Thanks

JR
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post #10 of 11
Thread Starter 
Update, with the computer set at 31*142 and memory running low no errors in Prime for 24 hours. So per the specs set the memory to 1996mhz (2000mhz rated) and 7-7-7-21 2T at 1.645v (supposed to be 1.65v but cant set exactly to that and doesnt seem to work any different). Crashes in prime with blend in under a minute. There is a trc setting but not sure in the bios what to change. Changed what i thought but wouldnt post. Now running at 8-8-8-21 1T. No errors yet but only 10 minutes. Do i need to up something to get the rated 7-7-7-21 at 2T?

Thanks

JR
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