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RAM and bus speed problem on P67/2500k

post #1 of 5
Thread Starter 
Specs are:

i5 2500k
P8P67 Pro
G.Skill 7-8-7-24 @ 1600, 1.6v 2x4gb

So my RAM doesn't quite run at it's advertised speed and latency, at best, it runs at some 700+mhz (so about 200 short). CPU-Z also shows that my bus speed is usually around 80-90 and it should be at 100. I've fiddled around bios for quite some time, trying all sorts of stuff - boosting voltage, setting higher ram timings, playing with bclk, etc., etc. Though it seems to me that I'm missing something, because, well, it should work, there's no reason it shouldn't.
Datalinks
(13 items)
 
  
CPUMotherboardGraphicsRAM
i5 2500k @4.0ghz 1.2v, ~50c under load P8P67 Pro 1502 8600GT 2x4gb @1600mhz 7-8-7-24 1.6v 
Hard DriveOSMonitorPower
HD103SJ 1tb Win7 x64 T710BH SeaSonic M12II 620w 
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Datalinks
(13 items)
 
  
CPUMotherboardGraphicsRAM
i5 2500k @4.0ghz 1.2v, ~50c under load P8P67 Pro 1502 8600GT 2x4gb @1600mhz 7-8-7-24 1.6v 
Hard DriveOSMonitorPower
HD103SJ 1tb Win7 x64 T710BH SeaSonic M12II 620w 
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post #2 of 5
you should update your BIOS and reset the CMOS after updating.
X99 Main Rig
(10 items)
 
  
CPUMotherboardGraphicsRAM
Intel 5960X Extreme Edition @ 4.5GHz Always Changing VisonTek R9 290 G.Skill Ripjaws 4 16GB (4x4GB) DDR4 @ 3200MHz 
Hard DriveHard DriveHard DriveCooling
Samsung 128GB M.2 PCI-E 4x SSD Apotop 256GB SSD 1.82TB NAS Noctua NH-D15 with both fans 
OSPower
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X99 Main Rig
(10 items)
 
  
CPUMotherboardGraphicsRAM
Intel 5960X Extreme Edition @ 4.5GHz Always Changing VisonTek R9 290 G.Skill Ripjaws 4 16GB (4x4GB) DDR4 @ 3200MHz 
Hard DriveHard DriveHard DriveCooling
Samsung 128GB M.2 PCI-E 4x SSD Apotop 256GB SSD 1.82TB NAS Noctua NH-D15 with both fans 
OSPower
Win7 Pro Enermax 1000W 
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post #3 of 5
Thread Starter 
Yeah, I already did that, it didn't help. At present I'm running the latest 1253 bios, according to cpu-z my bus rate is 89.2 and my ram runs at 713mhz, 7-8-7-24 (advertised latencies, but not advertised clock). You know, after fiddling in bios, it seems that the low bus rate is somehow connected to fsb:ram ratio. But it changes automatically on p67, afaik.

The bus rate also occasionally peaks to 200+mhz, that's normal, right? Has something do to with turbo?

edit: well, it runs @ 810mhz with latencies 9-9-9-24. So the ram is ok, or so it seems. The bus speed fell down to 86. There's definitely something I'm missing. Oh, btw, I set the target rate of ram frequency to 1866 in bios, so it's this setting that gave me 810mhz and fsb of 86.
Edited by nielsbohr - 1/25/11 at 4:03pm
Datalinks
(13 items)
 
  
CPUMotherboardGraphicsRAM
i5 2500k @4.0ghz 1.2v, ~50c under load P8P67 Pro 1502 8600GT 2x4gb @1600mhz 7-8-7-24 1.6v 
Hard DriveOSMonitorPower
HD103SJ 1tb Win7 x64 T710BH SeaSonic M12II 620w 
  hide details  
Reply
Datalinks
(13 items)
 
  
CPUMotherboardGraphicsRAM
i5 2500k @4.0ghz 1.2v, ~50c under load P8P67 Pro 1502 8600GT 2x4gb @1600mhz 7-8-7-24 1.6v 
Hard DriveOSMonitorPower
HD103SJ 1tb Win7 x64 T710BH SeaSonic M12II 620w 
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Reply
post #4 of 5
there is a huge problem with elpida hyper based ram and SB, maybe you have hypers. You have an ASUS board, try increasing VCCSA
X99 Main Rig
(10 items)
 
  
CPUMotherboardGraphicsRAM
Intel 5960X Extreme Edition @ 4.5GHz Always Changing VisonTek R9 290 G.Skill Ripjaws 4 16GB (4x4GB) DDR4 @ 3200MHz 
Hard DriveHard DriveHard DriveCooling
Samsung 128GB M.2 PCI-E 4x SSD Apotop 256GB SSD 1.82TB NAS Noctua NH-D15 with both fans 
OSPower
Win7 Pro Enermax 1000W 
  hide details  
Reply
X99 Main Rig
(10 items)
 
  
CPUMotherboardGraphicsRAM
Intel 5960X Extreme Edition @ 4.5GHz Always Changing VisonTek R9 290 G.Skill Ripjaws 4 16GB (4x4GB) DDR4 @ 3200MHz 
Hard DriveHard DriveHard DriveCooling
Samsung 128GB M.2 PCI-E 4x SSD Apotop 256GB SSD 1.82TB NAS Noctua NH-D15 with both fans 
OSPower
Win7 Pro Enermax 1000W 
  hide details  
Reply
post #5 of 5
Thread Starter 
And there was indeed something I've missed. I've turned off the turbo and speedstep options and voila! RAM runs as advertised, FSB is 100. It's kinda sad, since the turbo mode seems like a pretty good idea - I don't want my cpu to run at some 4+ghz 24/7.

So the question now is, can the turbo mode be fixed somehow? It throttles the ram and the fsb, which it shouldn't.


I finally figured out the problem - whenever you set a turbo multiplier higher than 33x, it throttles the fsb to match the frequency of 3300. In other words, it doesn't let you overclock higher than 3300. It's... bizzare.

edit: well, I finally figured it out. After 5+ friggin' hours it occured to me that I've been using an old version of CPU-Z. Naturally, after I've installed 1.56.3, everything is... ok. RAM is running as advertised, turbo is working perfectly - 16-33-40. 4ghz at ~1.27 volts, the temp is ~50c. What a waste of time
Edited by nielsbohr - 1/25/11 at 7:31pm
Datalinks
(13 items)
 
  
CPUMotherboardGraphicsRAM
i5 2500k @4.0ghz 1.2v, ~50c under load P8P67 Pro 1502 8600GT 2x4gb @1600mhz 7-8-7-24 1.6v 
Hard DriveOSMonitorPower
HD103SJ 1tb Win7 x64 T710BH SeaSonic M12II 620w 
  hide details  
Reply
Datalinks
(13 items)
 
  
CPUMotherboardGraphicsRAM
i5 2500k @4.0ghz 1.2v, ~50c under load P8P67 Pro 1502 8600GT 2x4gb @1600mhz 7-8-7-24 1.6v 
Hard DriveOSMonitorPower
HD103SJ 1tb Win7 x64 T710BH SeaSonic M12II 620w 
  hide details  
Reply
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