Overclock.net › Forums › Components › Memory › [SOLVED] RAM speed incorrect!? (on HTPC setup)
New Posts  All Forums:Forum Nav:

[SOLVED] RAM speed incorrect!? (on HTPC setup)

post #1 of 22
Thread Starter 
System specs:
AMD Athlon x2 3600+ 1.9Ghz
ASUS M2N-E
2x1GB OCZ Platinum 6400 Rev2, 800Mhz 4-4-4-15 1.9-2.1V (running SPD spec right now)
80GB OS HDD + 2TB media HDD
Windows 7 64-bit
Antec 380W Earthwatts PSU

Running a test MaxxMem at the default clocks I received a pisspoor 5.2GB/s (half what my main Hexagonal DDR3 PC gets). I decided to investigate and I found something awfully weird concerning the RAM speed.
It seems the RAM speed is completely out of order. I just installed some 2x1GB OCZ DDR2 and updated the BIOS on the ASUS M2N-E to the latest 5001 (apparently an AM3 beta BIOS, perhaps I should use 3001? it does not run AM3).

Instability is not a problem as the system is stable. My problem: RAM speed seems inconsistent and nonsense. MaxxMem detects 381Mhz (762Mhz DDR) which makes no sense. CPU-Z seems to detect it as fluctuating between 200Mhz (400 DDR) and 381Mhz (762Mhz DDR), also making no sense. the bus clock is set to the correct 200Mhz and the memory multiplier is correct. The timings are rated 4-4-4-15 1.9-2.1V but I am currently running the SPD 5-5-5-15 1.8V. EVEREST's detection matches CPU-Z's in RAM speed. How it would be running at 762Mhz really puzzles me as there's no possible multiplier option at 200Mhz bus clock that would let it run at that. Everything in the BIOS, save for the memory speed multiplier which is set to 800Mhz, is set to auto.

My thought is it's a BIOS issue and I'm working to revert it to 3001 from 5001. Your thought?
Edited by xd_1771 - 5/28/11 at 5:20pm
post #2 of 22
Probably BIOS issue. What speed does Memtest86+ report them as?
Desktop
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel i5 2500k [4.7 GHz] Asus P8P67 Pro B3 [2001 BIOS] MSI 7970 Lighting [Stock] G.Skill Ripjaws X 2x4GB [1600 MHz] 
Hard DriveOSMonitorKeyboard
Crucial M4 128GB + 2TB Raid 0 Cavier Black Windows 7 [Ultimate x64] [Dell U2412HM] + [HP 2311x] RosewillRK-9000 
PowerCaseMouse
Silverstone Strider [1500w] Corsair 300R Razer Deathadder 
  hide details  
Reply
Desktop
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel i5 2500k [4.7 GHz] Asus P8P67 Pro B3 [2001 BIOS] MSI 7970 Lighting [Stock] G.Skill Ripjaws X 2x4GB [1600 MHz] 
Hard DriveOSMonitorKeyboard
Crucial M4 128GB + 2TB Raid 0 Cavier Black Windows 7 [Ultimate x64] [Dell U2412HM] + [HP 2311x] RosewillRK-9000 
PowerCaseMouse
Silverstone Strider [1500w] Corsair 300R Razer Deathadder 
  hide details  
Reply
post #3 of 22
Thread Starter 
Nearly forgot about memtest, thanks for that. However, memtest is even more weird. The latest version (4.20) reports running at 477Mhz (954 DDR) !!!
post #4 of 22
Is there an option in the BIOS for setting what might be called the "FSB Memory Clock Mode" to "Unlinked"? If so, then I recommend using Unlinked in order to get the memory clock a little closer to 800 MHz.

When I had an nForce 680i SLI board (yeah, not AMD, but still an nForce chipset), I had to use Unlinked in order to get my memory clock speed as close as possible to what I wanted it to be.

Using "unlinked" actually unlocks a ton of hidden dividers which gives the illusion of the FSB and memory clocks being completely unlinked.
It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
  hide details  
Reply
It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
  hide details  
Reply
post #5 of 22
Thread Starter 
There is no such option on my board. First priority is now reducing to BIOS 3001.
post #6 of 22
Quote:
Originally Posted by xd_1771 View Post
There is no such option on my board. First priority is now reducing to BIOS 3001.
Damn.
It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
  hide details  
Reply
It's a computer!
(19 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
  hide details  
Reply
post #7 of 22
Thread Starter 
MaxxMem still reports it incorrectly on V3001, checking Windows...
post #8 of 22
Quote:
Originally Posted by xd_1771 View Post
MaxxMem still reports it incorrectly on V3001, checking Windows...
Did you try changing the slots ?
Desktop
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel i5 2500k [4.7 GHz] Asus P8P67 Pro B3 [2001 BIOS] MSI 7970 Lighting [Stock] G.Skill Ripjaws X 2x4GB [1600 MHz] 
Hard DriveOSMonitorKeyboard
Crucial M4 128GB + 2TB Raid 0 Cavier Black Windows 7 [Ultimate x64] [Dell U2412HM] + [HP 2311x] RosewillRK-9000 
PowerCaseMouse
Silverstone Strider [1500w] Corsair 300R Razer Deathadder 
  hide details  
Reply
Desktop
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel i5 2500k [4.7 GHz] Asus P8P67 Pro B3 [2001 BIOS] MSI 7970 Lighting [Stock] G.Skill Ripjaws X 2x4GB [1600 MHz] 
Hard DriveOSMonitorKeyboard
Crucial M4 128GB + 2TB Raid 0 Cavier Black Windows 7 [Ultimate x64] [Dell U2412HM] + [HP 2311x] RosewillRK-9000 
PowerCaseMouse
Silverstone Strider [1500w] Corsair 300R Razer Deathadder 
  hide details  
Reply
post #9 of 22
Thread Starter 
dixson recmomended disabling CnQ which appears to have removed the fluctuating, however it still runs at an incorrect speed. Next up is switching RAM slots then trying single DIMM operation.
At some point tonight it's going to stop mattering because this memory's going to be put in a different PC for benchmarking
post #10 of 22
It is because you are using an odd or fractional cpu multi.


Quoted from here http://www.overclock.net/amd-memory/...explained.html

" One Last Point:
What confuses people the most is the underclocking of memory caused by DDR2 memory paired with an odd or fractional CPU multiplier. Here's what makes it so difficult: THE DIVIDER MUST BE A WHOLE NUMBER. Why is that a big deal? I'll explain in a minute, but first, the three rules your memory follows:

1) The divider must be a whole number.
2) ("total CPU frequency")/divider cannot exceed 400MHz for DDR2 800, 333MHz for DDR2 667, 267MHz for DDR2 533, or 200MHz for DDR2 400 at the stock reference clock of 200MHz.
3) When choosing a divider, the CPU chooses the smallest number that won't violate rules 1 or 2.

Let's take an easy combination. The X2 4400+ Windsor with a 200MHz reference clock and a 12x multiplier and the memory set to DDR2 800. 200 x 12 = 2400MHz, the stock speed. Remember, with the memory set to DDR2 800, it sets your divider to the SMALLEST whole number that won't be greater than 400MHz. 2400/6 = 400, all rules are met. Why not set the divider to 5? 2400/5 = 480, this violates rule 2. Why not set the divider to 7? Because 6 met conditions 1 and 2, and rule 3 says choose the smallest number that works. Easy enough I hope, and it results in your memory running at what you expect it to, 400MHz (800MHz effective).

Let's make it more complicated. Take the X2 4200+ Windsor with a 200MHz reference clock and an 11x multiplier with the memory set to DDR2 800. 200 x 11 = 2200MHz, the stock speed. Remember, with the memory set to DDR2 800, it sets your divider to the SMALLEST whole number that won't be greater than 400MHz. What happens if we set the divider at 5? 2200/5 = 440MHz. This violates rule 2, so the divider stays at 6. Even though the 4200+ runs at 2200MHz and the 4400+ runs at 2400MHz, they use the same divider. Let's look at what effect this has on the memory's speed. 2200/6 = 366.67MHz (733MHz effective). Woah! Even though you set the memory to DDR2 800, it's being underclocked to DDR2 733. This is because ideally, the divider should be 5.5 (2200/5.5 = 400) but that violates rule 1. This is true for all odd CPU multipliers and DDR2 memory, your memory will be underclocked!

Think about it, only multiples of "total CPU speeds" of 400 work out evenly. i.e. 2000MHz, 2400MHz, 2800MHz, etc. If you have a CPU speed like 1800MHz, 2200MHz, 2600MHz, etc then you can't divide by a whole number and get 400, so your memory is being underclocked.

This means that the even multipliers are advantageous if you have good RAM, as they start your RAM at 400MHz instead of some underclocked value. 10x and 12x are very popular for overclockers with good memory because you can get more from your memory."


Gyro
My System
(14 items)
 
  
CPUMotherboardGraphicsGraphics
AMD Ph IIx4 955 @ 3.2 Asus M2N32-sli dlx Asus GTX 460 1gb DirectCU MSI GTX 460 1gb Cyclone 
RAMHard DriveOptical DriveOS
4x2gb OCZ ddr2 1066 plats seagate 320gb sata lg supermulti dvd WIN 7 64 
MonitorKeyboardPowerCase
acer p221w ms SS ST75F-P 750w CM 690modded w/KazeMaster pro 
Mouse
ms intellimouse explorer3.0 
  hide details  
Reply
My System
(14 items)
 
  
CPUMotherboardGraphicsGraphics
AMD Ph IIx4 955 @ 3.2 Asus M2N32-sli dlx Asus GTX 460 1gb DirectCU MSI GTX 460 1gb Cyclone 
RAMHard DriveOptical DriveOS
4x2gb OCZ ddr2 1066 plats seagate 320gb sata lg supermulti dvd WIN 7 64 
MonitorKeyboardPowerCase
acer p221w ms SS ST75F-P 750w CM 690modded w/KazeMaster pro 
Mouse
ms intellimouse explorer3.0 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Memory
Overclock.net › Forums › Components › Memory › [SOLVED] RAM speed incorrect!? (on HTPC setup)