Don ask me google bcoz i cant understand after google.
Wat's the different between QPI, DMI and FSB, QPI, DMI and FSB
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 Mar 11 2010, 02:12 PM, updated 16y ago
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#1
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Senior Member
2,736 posts Joined: Dec 2006   
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Wat's the different between QPI, DMI and FSB?
Don ask me google bcoz i cant understand after google. |
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Mar 11 2010, 03:46 PM
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#2
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Elite
24,351 posts Joined: Nov 2004 From: Setapak, Kuala Lumpur
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The architechture. Take a look at the diagrams included on their homepage.
P45 (FSB): http://www.intel.com/products/desktop/chip...45-overview.htm P55 (DMI): http://www.intel.com/products/desktop/chip...55-overview.htm X58 (QPI): http://www.intel.com/Products/Desktop/Chip...58-overview.htm One byte is equivalent to 8 bits. I think there are some typo errors for X58 DDR3 diagram. Should be big B(byte) instead of small b(bit). |
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Mar 11 2010, 03:48 PM
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#3
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Junior Member
127 posts Joined: Feb 2010 From: MY,NS,S2,GSH
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WOh .....PC jargon detected
hemm ...not easy but not hard (hope you have a love toward hardware system) » Click to show Spoiler - click again to hide... « (maybe this not help you) This post has been edited by Flybyhacker: Mar 11 2010, 03:50 PM |
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Mar 11 2010, 07:08 PM
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#4
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Senior Member
2,736 posts Joined: Dec 2006
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QUOTE(TristanX @ Mar 11 2010, 03:46 PM) The architechture. Take a look at the diagrams included on their homepage. thanks. i read tis before. I wanna know QPI is better than DMI? or vice versa and why.P45 (FSB): http://www.intel.com/products/desktop/chip...45-overview.htm P55 (DMI): http://www.intel.com/products/desktop/chip...55-overview.htm X58 (QPI): http://www.intel.com/Products/Desktop/Chip...58-overview.htm One byte is equivalent to 8 bits. I think there are some typo errors for X58 DDR3 diagram. Should be big B(byte) instead of small b(bit).  Added on March 11, 2010, 7:10 pmi know hardware combination is different i.e P55 don need ich10 but wat is QPI limitation and also DMI limitation? This post has been edited by Dennos: Mar 11 2010, 07:10 PM |
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Mar 11 2010, 07:27 PM
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#5
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Senior Member
1,241 posts Joined: Apr 2009
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(DMI) was the link between the NB and SB on the old boards, so it did not need to be very fast. QPI on the X58 does everything, so it must be much faster (on 1156, PCI-E lanes go directly from CPU to video cards).
The "lack" of speed compared to the QPI is just okay since the DMI connect's the "low speed devices" from the p55 chip to the CPU... ^-^ |
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Mar 11 2010, 07:37 PM
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#6
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Senior Member
2,736 posts Joined: Dec 2006
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from wat i search, CPU i5i7(1156) is using DMI while i7(1366) is using QPI.
If i5(1156) DMI speed is similar to i7(1366) QPI, is there any different? |
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Mar 11 2010, 07:43 PM
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#7
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Elite
24,351 posts Joined: Nov 2004 From: Setapak, Kuala Lumpur
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i7 LGA1366 has memory controller integrated on it. This setup reduces the latency.
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Mar 11 2010, 09:50 PM
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#8
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Elite
8,711 posts Joined: Nov 2007 From: Butterworth, PG / Machang, Kelantan 
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Result from google as well:
Actually they work the same except the DMI has a build-in PCIE controller, meaning that the PCIE lanes for dual card setup are split automatically into 8/8 lanes instead of full 16/16 lanes on a x58 aka P55 is bad for SLI/CF |
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Mar 11 2010, 10:37 PM
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#9
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Senior Member
2,736 posts Joined: Dec 2006
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that means i5 750(1156) and i7 920(1366) are same in "speed" if the value ram and single card is used for both setup ?
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Mar 11 2010, 10:51 PM
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Elite
5,602 posts Joined: Jul 2007 From: The Holiest Of Hole
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QUOTE(Dennos @ Mar 11 2010, 10:37 PM) that means i5 750(1156) and i7 920(1366) are same in "speed" if the value ram and single card is used for both setup ? what kind of "speed" do u mean?? |
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Mar 11 2010, 11:02 PM
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Senior Member
2,736 posts Joined: Dec 2006
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QUOTE(hilmiangah @ Mar 11 2010, 10:51 PM) what kind of "speed" do u mean?? simulation in specific. Process a bunch of data to get the result. Nothing to do with graphic or 3d. Thanks |
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Mar 11 2010, 11:16 PM
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Elite
5,602 posts Joined: Jul 2007 From: The Holiest Of Hole
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QUOTE(Dennos @ Mar 11 2010, 11:02 PM) simulation in specific. Process a bunch of data to get the result. Nothing to do with graphic or 3d. Thanks for that kind of task i think 8 processing thread(the 920) should be faster than 4 processing threads(the 750) provided the application is optimise for multithreaded operation. |
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Mar 11 2010, 11:41 PM
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Elite
8,711 posts Joined: Nov 2007 From: Butterworth, PG / Machang, Kelantan
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i7 920 X58 has higher mem bandwidth with triple channel
i7 920 is faster than i5 750 in whatever occasion. |
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