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QPI - Ive been out of it for a while and miss FSB

post #1 of 7
Thread Starter 
So I'll probably be putting together a new rig soon but the first thing I used to do is look for a CPU//Memory/MB with the fastest FSB (which was simple and easy). Now that QPI has replaced FSB, I'm not sure what to look for.

Does memory speed automatically govern the speed between the memory and CPU now? I assume maybe QPI's max speed is well above any memory speed so you don't need to worry about it and just get the fastest memory you can find?

I read the wiki on QPI but it didn't explain these very well so was hoping I could get this clarified.

Help me out folks...
Edited by Malisk - 3/11/11 at 4:35pm
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post #2 of 7
This would take me a few mins to type up so I will give you the link.

http://www.hardwaresecrets.com/print...onnect-QPI/610

Much better than the wiki. Hope that helps.
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post #3 of 7
When I can afford it, I will build an LGA 775 system that I will personally take care of and preserve, and will serve as a tribute to the best socket ever made.

I will use one of the iconic and amazing CPUs that graced the socket: Either the E8400, Q6600 or the Q9550.
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post #4 of 7
QPI is just a bus, one that has negligible impact on real world performance at that.

You still OC in a manner similarly to the way you always have, it's just that the reference clock (BCLK) isn't directly linked to any particular bus, and that everything connects to the CPU, and not a chipset.
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post #5 of 7
Thread Starter 
Quote:
Originally Posted by Krymore View Post
This would take me a few mins to type up so I will give you the link.

http://www.hardwaresecrets.com/print...onnect-QPI/610

Much better than the wiki. Hope that helps.
Awsome, thanks for the reply.

I still have a question though. Lets say I get some DDR3 2400Mhz (or overclock the mem to that level), will anything cause the memory bandwidth to lower due to another component being lower speed like with FSB? I just want to make sure that if I buy high speed memory it will run at that speed and not be lowered by another component.
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post #6 of 7
Quote:
Originally Posted by Malisk View Post
I still have a question though. Lets say I get some DDR3 2400Mhz (or overclock the mem to that level), will anything cause the memory bandwidth to lower due to another component being lower speed like with FSB? I just want to make sure that if I buy high speed memory it will run at that speed and not be lowered by another component.
Uncore clock.

The uncore is the L3 cache and the IMC, which have their own multiplier and clock speed, independent of CPU core speed, at least on the first gen Core iX chips.

Sandy Bridge always runs the uncore clock at full CPU speed, so in this respect there is less to worry about. Still, fast CPU means faster memory controller now, so that will have a more profound impact on memory bandwidth than it did in the past.
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post #7 of 7
Thread Starter 
I see.

So as long as I get the fastest CPU I can be sure memory bandwidth is being utilized most efficiently.
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