mix up 2 1024 slots with 2 512 slots

[SeaMan909]

Hi there,

first I bought 2 sticks crosair dual channel 512MB

then I wanted to add more RAM, so I bought 2 sticks 1024GB (same model)

when I tried to add the 2X1024, the system did not start (boot)

when I removed the 2X1024, kept only the 2X512MB, it worked perfectly fine.

I tried the same by keeping only the 2X1024GB, and it worked fine.

 

when I want to add them all together, the system did not work.

 

I thought I need to install windows from the beginning.

then I decided to do the install with all RAM slots full, I started the installation and I couldn't progress a lot because the PC always hung.

 

OS: windows xp, windows vista, I tried both

motherboard: Asus A8N SLI premium

CPU: AMD 64 Athlon 4800+ Dual Core

 

any idea?

Thank you

[RAM GUY]

I am sorry but I would not suggest mixing memory on any MB, and if you install more than two modules with this MB DDR333 would be suggest and I would set the memory Voltage to 2.75 Volts and set the NB/MCH Voltage to +.05 Volts and you cannot mix the modules in different channels.

[SeaMan909]

sorry, maybe i wasn't clear, what I meant by mixing is:

I used first dual channel for 1024MB, and the second for 512MB, what I meant by mixing is I did not use 4X1024MB, or 4X512MB

I used 2X1024MB, 2X512

I did not mix the slots with different RAM.

did you answer me according to this?

[RAM GUY]

Yes you should not mix memory with this platform and if the modules are the same part number but different revisions sometimes they will not work together.

I would try the two 512 in the fist set of dual channel slots IE: A1 and B1 and the two 1.0 Gig modules in slots A2 and B2 and see if it will post. If so then set the memory frequency at DR333 and set the memory Voltage to 2.75 Volts and set the timings manually to Cas 2.5-3-3-7 and set the command Rate to 2T. Then test the system with http://www.memtest.org.

[SeaMan909]

Yes you should not mix memory with this platform and if the modules are the same part number but different revisions sometimes they will not work together.

I would try the two 512 in the fist set of dual channel slots IE: A1 and B1 and the two 1.0 Gig modules in slots A2 and B2 and see if it will post. If so then set the memory frequency at DR333 and set the memory Voltage to 2.75 Volts and set the timings manually to Cas 2.5-3-3-7 and set the command Rate to 2T. Then test the system with http://www.memtest.org.

 

Hi RAM Guy,

I couldn't find DR333, I didn't understand timing to cast (2.5-3-3-7) are these 4 different values or what?

I couldn't find the command rate

there was something else in the previous post from you, i couldn't find also.

here is what i have:

I'm using Phoenix AwardBios and I don't see these settings.

here is what I have:

i found under JumperFree configuration (overclocking place)

DDR voltage, other settings i don't think it is related.

under CPU configuration -> DRAM configuration:

MemLock index value (Mhz) 200Mhz

CAS# latency (Tcl) 2.5

Min RAS# active time(Tras) 5T

RAS# to CAS# delay (Trcd) 3T

Row precharge Time (Trp) 3T

Row Cycle time (Trc) 7T

Row refresh cyc time (Trfc) 9T

Read-to-Write time (Trfc) 3T

Write Recovery time ( Twr) 2T

1T/2T Memory timing 2T

S/W DRAM over 4G Remapping (enabled)

H/W DRAM over 4G Remapping (enabled)

 

as you see I couldn't found exactly what you have asked me to set.

only the DRR voltage and if it was this one, i did set it to 3.75 and the windows started but hung in the booting process.

also I don't have any POST.

 

any idea?

[RAM GUY]

You need to reset the BIOS with the CLRTC Jumper and then see if you can get to the BIOS and load setup Defaults and then set these settings.

under JumperFree configuration

DDR voltage: 2.7X Volts

under CPU configuration -> DRAM configuration:

MemLock index value (Mhz) 166Mhz

CAS# latency (Tcl) 2.5

Min RAS# active time(Tras) 7T

RAS# to CAS# delay (Trcd) 3T

Row precharge Time (Trp) 3T

Command Rate 2T

 

Then test the system with http://www.memtest.org but you need to disable legacy USB when running any memory test on most ASUS MB's

[SeaMan909]

You need to reset the BIOS with the CLRTC Jumper and then see if you can get to the BIOS and load setup Defaults and then set these settings.

under JumperFree configuration

DDR voltage: 2.7X Volts

under CPU configuration -> DRAM configuration:

MemLock index value (Mhz) 166Mhz

CAS# latency (Tcl) 2.5

Min RAS# active time(Tras) 7T

RAS# to CAS# delay (Trcd) 3T

Row precharge Time (Trp) 3T

Command Rate 2T

 

Then test the system with http://www.memtest.org but you need to disable legacy USB when running any memory test on most ASUS MB's

 

sorry to bug you again but you are not consistant..

do you mean DR333 is the MemLock index value?

because it has 333Mhz, but the your last post you said 166Mhz, now which one should I put?

second thing, I mentioned to you, I don't have something called command Rate.

look at my list, I laid out for your all the settings, tell me which one is the command Rate??

 

Thanks

[RJLeong65]

sorry to bug you again but you are not consistant..

do you mean DR333 is the MemLock index value?

because it has 333Mhz, but the your last post you said 166Mhz, now which one should I put?

second thing, I mentioned to you, I don't have something called command Rate.

look at my list, I laid out for your all the settings, tell me which one is the command Rate??

 

Thanks

 

The "Command rate" setting is labeled "1T/2T Memory timing" in your motherboard's BIOS.

[RAM GUY]

DDR333 = 166 MHz Clock Speed X 2 = DDR333.