wytiwx Posted July 17, 2021 Share Posted July 17, 2021 We all know that P45 has memory div 3:5 bug, but I still wonder: 1. Does this bug exist in all P45 boards? For exmaple, is in all DDR2 and DDR3 board? is in all chipset rev. A2 and A3? 2. If not all P45 board have this bug, how can we confirm that when we use 3:5 ? Quote Link to comment Share on other sites More sharing options...
TerraRaptor Posted July 17, 2021 Share Posted July 17, 2021 it exists in x48 ddr3 too. 2:3 strap 400 is displayed as 3:5 too. It is common CPUZ bug I believe for all P45/X48 boards (and I assume X38/P35). Quote Link to comment Share on other sites More sharing options...
wytiwx Posted July 25, 2021 Author Share Posted July 25, 2021 I did some memory bandwith test by AIDA64, I don't think it has 3:5 bug for my EP45T-UD3R 1. E8400 (500x6), 400 strap, div 3:4, DDR3 1333 6-6-6, PL9 2. E8400 (500x6), 400 strap, div 3:5, DDR3 1666 6-6-6, PL9 3. E8400 (500x6), 333 strap, div 5:8, DDR3 1600 6-6-6, PL9 Quote Link to comment Share on other sites More sharing options...
Noxinite Posted July 25, 2021 Share Posted July 25, 2021 Well the EP45T-Extreme definitely has this bug. Quote Link to comment Share on other sites More sharing options...
wytiwx Posted July 25, 2021 Author Share Posted July 25, 2021 Quote Link to comment Share on other sites More sharing options...
wytiwx Posted July 25, 2021 Author Share Posted July 25, 2021 3 minutes ago, Noxinite said: Well the EP45T-Extreme definitely has this bug. THX for the info. Quote Link to comment Share on other sites More sharing options...
frag_ Posted July 25, 2021 Share Posted July 25, 2021 (edited) What would happen when you compare strap 400 2:3 vs 5:8 vs 3:5? If it's not bugged then 2:3 < 5:8 < 3:5 in terms of speed, but if it's bugged then 2:3 ~ 3:5 < 5:8, isn't it? Edited July 25, 2021 by frag_ Quote Link to comment Share on other sites More sharing options...
wytiwx Posted July 25, 2021 Author Share Posted July 25, 2021 54 minutes ago, frag_ said: What would happen when you compare strap 400 2:3 vs 5:8 vs 3:5? If it's not bugged then 2:3 < 5:8 < 3:5 in terms of speed, but if it's bugged then 2:3 ~ 3:5 < 5:8, isn't it? Well，if FSB and Mem freq is almost the same, then I think mem performance should be strap 400 ＜ 333 ＜266 ＜ 200. But if FSB and Mem freq scares too much, things will become complicate. Quote Link to comment Share on other sites More sharing options...
Noxinite Posted July 25, 2021 Share Posted July 25, 2021 On Giga P45 the straps do perform quite a big different. Quote Link to comment Share on other sites More sharing options...
TaPaKaH Posted July 26, 2021 Share Posted July 26, 2021 @wytiwx So, setting #2 is actually 750MHz / DDR3-1500 mem speed, which falls perfectly in line with the DDR3-1333 and DDR3-1600 results you've posted Quote Link to comment Share on other sites More sharing options...
wytiwx Posted July 26, 2021 Author Share Posted July 26, 2021 8 hours ago, TaPaKaH said: @wytiwx So, setting #2 is actually 750MHz / DDR3-1500 mem speed, which falls perfectly in line with the DDR3-1333 and DDR3-1600 results you've posted Is mem bandwidth of 750MHz/DDR3-1500 the experimental results? But in other words, if we have to use 3:5 for efficiency rather than raw mem freq in particular conditions, it doesn't matter whether there is a bug or not. Quote Link to comment Share on other sites More sharing options...
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