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BIOS QPI link speed

Post Date: 2010-08-28
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Vorlon View Drop Down
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Posts: 57 		  Quote Vorlon Quote  Post ReplyReply bullet Topic: BIOS QPI link speed
    Posted: 28 Aug 2010 at 1:15pm
I see many post where the QPI link speed has been changed from (auto) to 8.6
 
I am in early days doing an OC on my EVGA X58 Classified 3 SLI motherboard
w/980x CPU,  6GB of 2000 mhz HyperX RAM,and  EVGA 480 SLI vid cards.
 
 The CPU, chipset, an both vid cards are water cooled with a sub-zero stage 6 water cooler system DS installed.
 
I have what looks to be a stable 4.0 OC with temp running a hi of 62c so I believe there is room to improve this. Running prime95 as I write this.
 
It would help if I understood what the QPI link speed should be set too.
 
Thanks in advance.
 
V.
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Vorlon View Drop Down
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Posts: 57 		  Quote Vorlon Quote  Post ReplyReply bullet Posted: 29 Aug 2010 at 8:39am
I don't see this in my BIOS as an option. So..  I think I will wait for DS to call me on monday.
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Vorlon View Drop Down
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Posts: 57 		  Quote Vorlon Quote  Post ReplyReply bullet Posted: 31 Aug 2010 at 8:30am
I had a nice chatt via email with DS tech Steve.  I understand what this is now. I do not realy need to change it from (Auto) but I could set it to 4.6 as it "may" help to stable an OC. Some benchmark fans like to set this to 6.8 as they think it helps with extream OC.  In my case I didn't need it.  I have a stable OC at 4.0  
Thanks,  again DS
 
V.
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justin.kerr View Drop Down
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Posts: 5084 		  Quote justin.kerr Quote  Post ReplyReply bullet Posted: 31 Aug 2010 at 9:04am

with the B clock so low, your QPI link is very slow, which will lower peformance, that is why I suggested raising it.

It has nothing to do with the  setting, 4.6, 5.6 6.8 ect, it is the total QPI speed that counts.. to say that benchmark fans like it at 6.8 is not correct,  because it makes it impossible to use that high of multi when the b clock is much higher.
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Vorlon View Drop Down
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Posts: 57 		  Quote Vorlon Quote  Post ReplyReply bullet Posted: 31 Aug 2010 at 9:35am
First I should make sure we are all talking about the same thing.
When you say "Your B clock is so low" are you speaking of the 139 buss I set to get to a 4.0 OC.  I'm at 29 X 139 = 4.031 correct?
 
The DS tech advised that I would see no change in my OC by moving from (Auto) to any of other settings because it had more to do with multi CPU systems; and that changing it would not "hurt" my system.  My warrenty is with them so I was happy to hear that. hehe
 
I have a stable OC set at 4.0 now but if my system can see better proformance with a change in that setting I'm more then happy to give it a try.
 
I realy want to understand this so thank you in advance for "schooling me" by sharing what you know.
 
V.
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Posts: 2247 		  Quote Dragoonseal Quote  Post ReplyReply bullet Posted: 31 Aug 2010 at 9:44am
The 139 bus, yes, thought it isn't referred to that anymore with this platform, it is called the base clock (BCLK).

What Justin is saying is that the BCLK influences the performance of a lot of things on the motherboard, QPI link, CPU, memory, etc. So basically don't just raise the CPU multiplier constantly, starting raising the BCLK instead.

Keep in mind raising the BLCK also raises memory speed though, so lower the memory multiplier if needed to compensate.
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Vorlon View Drop Down
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Posts: 57 		  Quote Vorlon Quote  Post ReplyReply bullet Posted: 31 Aug 2010 at 9:54am
If I understand this right.   167 X 24 = 4008  = OC of 4.0
Just as does my.               139 X 29 = 4031 = OC of 4.0
The 167 would be a better OC for better proformance.  Is that the point?
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Posts: 2247 		  Quote Dragoonseal Quote  Post ReplyReply bullet Posted: 31 Aug 2010 at 10:02am
Originally posted by Vorlon

If I understand this right.   167 X 24 = 4008  = OC of 4.0
Just as does my.               139 X 29 = 4031 = OC of 4.0
The 167 would be a better OC for better proformance.  Is that the point?

Right. But also keep in mind that memory speed is BCLK times the memory multiplier, so you'll have to adjust its multiplier accordingly as you raise BCLK.
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Posts: 4219 		  Quote !ender_ Quote  Post ReplyReply bullet Posted: 31 Aug 2010 at 10:04am
yup, blck is the number you want to raise the most, it actually matters more than your actual clock speed, which is why i choose 4.00 over 4.2 becuase i can get a 200 blck and run my ram at its amazing 2400mhz
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Posts: 5084 		  Quote justin.kerr Quote  Post ReplyReply bullet Posted: 31 Aug 2010 at 10:25am

B clock speed, in itself won't help, but raising the QPI speed will, you can do that 2 ways, one, up the QPI  speed multi, or 2, raise the B clock and keep a low QPI multi, but that will raise other aspects, like Dragoonseal said.

QPI is not for multi CPU's. lol  I can't post pics at work, put Dragoonseal has  a pic that shows the QPI and how the CPU uses it to transmit data
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Posts: 2247 		  Quote Dragoonseal Quote  Post ReplyReply bullet Posted: 31 Aug 2010 at 10:33am
Oh, this?



Basically the QPI connects the CPU to just about everything else. Though it also allows CPU to CPU communication in multi CPU chipsets like the 5520, shown below.
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Posts: 5084 		  Quote justin.kerr Quote  Post ReplyReply bullet Posted: 31 Aug 2010 at 10:44am
Thanks Dragoonseal. lol
 
On multi CPU setups,  the Xeon CPU's  have dual QPI links, but not aplicable here, so I did not want to confuse him. lol
 
Also there was a few asking questions about the short 1x PCIe on some mobos, and its effects on PCIe lane bandwidth. I believe that Pcie x1 cards, like the creative XFi when placed in the mini PCIE slot run off the south bridge? that is what I always do. lol
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Vorlon View Drop Down
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Posts: 57 		  Quote Vorlon Quote  Post ReplyReply bullet Posted: 31 Aug 2010 at 11:02am
WOW! 
 
Back to OC school I go.  
 
I have my first 4.0 saved as a profile so I'm free to play with the bios settings.
 
I like that ideal of a 201 X 20 it even looks cool.  If I set my RAM at 2:10 I can take it to 2010. 
 
Lots an lots to play with yet. I'll keep you posted.
 
If those of you who have the EVGA Classified SLI 3 and a 980X CPU with a stable OC  better then the one I now have could post thier bios settings I'd have an ideal of where to start.
 
I may need a new DEL key soon.  *smile*
V.
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Posts: 156 		  Quote neilkaz Quote  Post ReplyReply bullet Posted: 31 Aug 2010 at 2:07pm
Since your not close to hot with that 4 GHz OC and if considering 20 x 201, I suggest trying 21 x 201 instead for 4.2 GHz. Of course you'll need to raise voltages, especially V-core.
 
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Posts: 4219 		  Quote !ender_ Quote  Post ReplyReply bullet Posted: 31 Aug 2010 at 2:59pm
i think you misunderstood his post lol, first he meant to say 200x20, and he was saying it looks cool not it IS cool.. though hes using water and my 200x20 is on air so he could do a lot more without a problem though im not very versed on the limits of 6 cores
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Posts: 156 		  Quote neilkaz Quote  Post ReplyReply bullet Posted: 31 Aug 2010 at 3:26pm
Originally posted by !ender_

i think you misunderstood his post lol, first he meant to say 200x20, and he was saying it looks cool not it IS cool.. though hes using water and my 200x20 is on air so he could do a lot more without a problem though im not very versed on the limits of 6 cores
 
No missunderstanding here. His hottest cores were 62C when running the usual OC stability tests. He can run hotter than that for sure so I suggested 21 x 201.
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