{"video_id":"C2b5j73uIEQ","title":"P67 PCIe Slot Performance Comparison With OCZ Revodrive X2 Linus Tech Tips","channel":"Linus Tech Tips","show":"Linus Tech Tips","published_at":"2011-05-08T14:53:29Z","duration_s":246,"segments":[{"start_s":0.76,"end_s":9.04,"text":"now as some of you may know uh Intel's","speaker":null,"is_sponsor":0},{"start_s":4.6,"end_s":11.24,"text":"p67 platform has only 16 PCI Express","speaker":null,"is_sponsor":0},{"start_s":9.04,"end_s":15.0,"text":"Lanes available for graphics configurations well basically available","speaker":null,"is_sponsor":0},{"start_s":12.92,"end_s":17.56,"text":"for your main two PCI E slots here I'm going to show you a board that doesn't","speaker":null,"is_sponsor":0},{"start_s":16.119,"end_s":21.76,"text":"have stuff installed on it so you've only got 16 PCI ex press","speaker":null,"is_sponsor":0},{"start_s":20.279,"end_s":26.039,"text":"lanes for this one and this one which means you can either do 16x and actually","speaker":null,"is_sponsor":0},{"start_s":24.599,"end_s":31.64,"text":"I think you can make it run at 1X so it might be 17 PCI Express lames not the","speaker":null,"is_sponsor":0},{"start_s":28.279,"end_s":34.28,"text":"point okay so it's either 16 X or 8X 8X","speaker":null,"is_sponsor":0},{"start_s":31.64,"end_s":40.16,"text":"on these two now some Sandy Bridge boards p67 boards that is have a third","speaker":null,"is_sponsor":0},{"start_s":37.32,"end_s":47.52,"text":"PCI Express 16x physical slot this isn't the only one but this is the ASUS","speaker":null,"is_sponsor":0},{"start_s":43.44,"end_s":49.399,"text":"p67 uh p8 p67 Deluxe and this one does","speaker":null,"is_sponsor":0},{"start_s":47.52,"end_s":56.84,"text":"have a third slot so because there's only 16 Lanes running off of the CPU","speaker":null,"is_sponsor":0},{"start_s":53.68,"end_s":59.16,"text":"itself for those graphics card slots","speaker":null,"is_sponsor":0},{"start_s":56.84,"end_s":62.48,"text":"where does this extra PCI e6x slot run off of well","speaker":null,"is_sponsor":0},{"start_s":60.519,"end_s":68.64,"text":"the answer is that this is actually only a PCIe 4X","speaker":null,"is_sponsor":0},{"start_s":64.76,"end_s":71.84,"text":"slot and it actually runs off of the","speaker":null,"is_sponsor":0},{"start_s":68.64,"end_s":73.64,"text":"chipset so there is an inherent delay","speaker":null,"is_sponsor":0},{"start_s":71.84,"end_s":80.079,"text":"now the chipset does get a fair bit of bandwidth to the CPU itself but that","speaker":null,"is_sponsor":0},{"start_s":77.24,"end_s":86.04,"text":"PCIe slot is actually not tied directly to the CPU the way that the other ones","speaker":null,"is_sponsor":0},{"start_s":82.159,"end_s":88.04,"text":"are so I had someone ask me a question","speaker":null,"is_sponsor":0},{"start_s":86.04,"end_s":93.96,"text":"what if you're running something like this like an ocz Revo Drive X2 to 40 gig","speaker":null,"is_sponsor":0},{"start_s":92.479,"end_s":98.64,"text":"I happen to have one handy is there a performance difference","speaker":null,"is_sponsor":0},{"start_s":96.56,"end_s":102.68,"text":"between running it off of a PCIe slot that's running off the CPU versus","speaker":null,"is_sponsor":0},{"start_s":100.88,"end_s":107.24,"text":"running it off a PCIe slot that's running off what is essentially in","speaker":null,"is_sponsor":0},{"start_s":104.28,"end_s":110.36,"text":"archaic terms the South Bridge so this video is an attempt to answer that I'm","speaker":null,"is_sponsor":0},{"start_s":108.799,"end_s":117.52,"text":"just going to be using Crystal disc Mark to keep things simple and so I'm running","speaker":null,"is_sponsor":0},{"start_s":113.56,"end_s":119.92,"text":"five uh five times the entire test I'm","speaker":null,"is_sponsor":0},{"start_s":117.52,"end_s":126.52,"text":"running it over a 4 gig span of the drive and here are my results running it","speaker":null,"is_sponsor":0},{"start_s":122.32,"end_s":128.44,"text":"in the in theory faster PCIe slot and","speaker":null,"is_sponsor":0},{"start_s":126.52,"end_s":132.8,"text":"now I'm going to run it in the other PCI slot and see what happens well it would","speaker":null,"is_sponsor":0},{"start_s":130.679,"end_s":138.519,"text":"appear that I have my answer the sequential numbers are oddly enough uh","speaker":null,"is_sponsor":0},{"start_s":135.519,"end_s":142.2,"text":"very very close for reads uh this is","speaker":null,"is_sponsor":0},{"start_s":138.519,"end_s":143.64,"text":"running off of the chipset PCI E slot","speaker":null,"is_sponsor":0},{"start_s":142.2,"end_s":149.28,"text":"and then the screenshot I have here on the left is running off of the CPU PCI","speaker":null,"is_sponsor":0},{"start_s":147.04,"end_s":153.2,"text":"Express slot so the sequential reads are pretty much Within margin of error the","speaker":null,"is_sponsor":0},{"start_s":151.2,"end_s":159.959,"text":"sequential rights look to be a little bit higher on the on the chipset PCI","speaker":null,"is_sponsor":0},{"start_s":157.28,"end_s":165.4,"text":"Express slot for whatever reason and then moving down into the random reads","speaker":null,"is_sponsor":0},{"start_s":163.0,"end_s":170.04,"text":"and wrs it looks like for reads we're pretty much within the margin of error","speaker":null,"is_sponsor":0},{"start_s":167.44,"end_s":175.08,"text":"but then for random rights for whatever reason actually well random reads here","speaker":null,"is_sponsor":0},{"start_s":172.56,"end_s":181.2,"text":"you know what overall random performance seems to be higher on the CPU PCI","speaker":null,"is_sponsor":0},{"start_s":177.72,"end_s":183.879,"text":"Express versus on the chipset PCI","speaker":null,"is_sponsor":0},{"start_s":181.2,"end_s":191.68,"text":"Express and that does seem to be like a noticeable overall trend um so yeah I'm","speaker":null,"is_sponsor":0},{"start_s":188.76,"end_s":196.519,"text":"not sure why that would be maybe it's to do with the latencies involved although","speaker":null,"is_sponsor":0},{"start_s":194.12,"end_s":199.519,"text":"storage latencies are usually","speaker":null,"is_sponsor":0},{"start_s":199.76,"end_s":205.2,"text":"um what I should say is uh is is chipset","speaker":null,"is_sponsor":0},{"start_s":203.159,"end_s":210.0,"text":"latencies are usually nothing compared to storage latencies uh so I I wouldn't","speaker":null,"is_sponsor":0},{"start_s":208.4,"end_s":215.64,"text":"have thought that it would affect it that much but it looks like uh for","speaker":null,"is_sponsor":0},{"start_s":212.959,"end_s":221.519,"text":"whatever reason the the uh the lower latency between the CPU and this PCI","speaker":null,"is_sponsor":0},{"start_s":218.879,"end_s":226.56,"text":"Express slot versus the CPU to that chipset to that PCI Express slot seems","speaker":null,"is_sponsor":0},{"start_s":224.48,"end_s":232.799,"text":"to give us slightly better performance in random reads both in a light workload","speaker":null,"is_sponsor":0},{"start_s":230.319,"end_s":237.799,"text":"scenario as well as in a heavy workload scenario so thank you for checking out","speaker":null,"is_sponsor":0},{"start_s":234.72,"end_s":241.04,"text":"this little Linus Tech tips video about","speaker":null,"is_sponsor":0},{"start_s":237.799,"end_s":242.4,"text":"the revo Drive X2 on the PC 67 chipset","speaker":null,"is_sponsor":0},{"start_s":241.04,"end_s":247.36,"text":"don't forget to subscribe for more unboxings reviews and other computer","speaker":null,"is_sponsor":0},{"start_s":244.36,"end_s":247.36,"text":"videos","speaker":null,"is_sponsor":0}],"full_text":"now as some of you may know uh Intel's p67 platform has only 16 PCI Express Lanes available for graphics configurations well basically available for your main two PCI E slots here I'm going to show you a board that doesn't have stuff installed on it so you've only got 16 PCI ex press lanes for this one and this one which means you can either do 16x and actually I think you can make it run at 1X so it might be 17 PCI Express lames not the point okay so it's either 16 X or 8X 8X on these two now some Sandy Bridge boards p67 boards that is have a third PCI Express 16x physical slot this isn't the only one but this is the ASUS p67 uh p8 p67 Deluxe and this one does have a third slot so because there's only 16 Lanes running off of the CPU itself for those graphics card slots where does this extra PCI e6x slot run off of well the answer is that this is actually only a PCIe 4X slot and it actually runs off of the chipset so there is an inherent delay now the chipset does get a fair bit of bandwidth to the CPU itself but that PCIe slot is actually not tied directly to the CPU the way that the other ones are so I had someone ask me a question what if you're running something like this like an ocz Revo Drive X2 to 40 gig I happen to have one handy is there a performance difference between running it off of a PCIe slot that's running off the CPU versus running it off a PCIe slot that's running off what is essentially in archaic terms the South Bridge so this video is an attempt to answer that I'm just going to be using Crystal disc Mark to keep things simple and so I'm running five uh five times the entire test I'm running it over a 4 gig span of the drive and here are my results running it in the in theory faster PCIe slot and now I'm going to run it in the other PCI slot and see what happens well it would appear that I have my answer the sequential numbers are oddly enough uh very very close for reads uh this is running off of the chipset PCI E slot and then the screenshot I have here on the left is running off of the CPU PCI Express slot so the sequential reads are pretty much Within margin of error the sequential rights look to be a little bit higher on the on the chipset PCI Express slot for whatever reason and then moving down into the random reads and wrs it looks like for reads we're pretty much within the margin of error but then for random rights for whatever reason actually well random reads here you know what overall random performance seems to be higher on the CPU PCI Express versus on the chipset PCI Express and that does seem to be like a noticeable overall trend um so yeah I'm not sure why that would be maybe it's to do with the latencies involved although storage latencies are usually um what I should say is uh is is chipset latencies are usually nothing compared to storage latencies uh so I I wouldn't have thought that it would affect it that much but it looks like uh for whatever reason the the uh the lower latency between the CPU and this PCI Express slot versus the CPU to that chipset to that PCI Express slot seems to give us slightly better performance in random reads both in a light workload scenario as well as in a heavy workload scenario so thank you for checking out this little Linus Tech tips video about the revo Drive X2 on the PC 67 chipset don't forget to subscribe for more unboxings reviews and other computer videos"}