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PC not accepting new RAM

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June 23, 2011 2:50:35 AM

Hello,I'm having a bit of an issue here. I have 2x2GB sticks of 4GB DDR3 1600 DIMM 240-pin RAM in there now.

I just bought and installed 2x4GB 240-pin DDR3 1600 PC3 12800. The fans and lights come on, but nothing displays. I've tried the new RAM in all 4 slots, in every combination. Nothing.

I take it out and put the old RAM back in and it boots up just fine. I'm not sure what to do.

Running Windows 7. Says I can use up to 16GB of RAM. Motherboard is an AMD 770.

I poked around in the BIOS for an hour or so before realizing I didn't know what I was doing.

Any help would be much appreciated. Thanks for your time.

More about : accepting ram

a b V Motherboard
June 23, 2011 3:06:15 AM

What model AMD 770? Could be the timing of the new memory sticks differ.
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June 23, 2011 6:40:18 PM

Opened it up and got these numbers off of it:

M4A77TD

9AM0AB157476

Thanks for your time.
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June 23, 2011 7:23:19 PM

Is your RAM set to run at 1600 MHz? This is a BIOS setting. You can check your RAM clock in windows by using CPUZ.

If your RAM is running at 1600, try turning it down to 1333 and see if that fixes your stability problem.
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June 23, 2011 8:49:53 PM

Ok, I went into the BIOS and switched it from Auto to 1333. BTW Thanks for recommending CPUZ, it was a great help.

I install the new RAM at 1333 and start up the PC...It starts up. I get this message:
http://img29.imageshack.us/img29/9859/photoiiy.jpg

I hit F2, load the default values, and it boots up. I check my RAM and there is it, 8.00 GB.

I restart it for the hell of it and now get the same problem where it will not boot up. Do I need to do anything other than hit Save and Exit in BIOS to keep those changes? Or should I have run setup again when that black screen came up?

Thanks for your help. I'm so glad it started once! I think it means things are close to working :D 
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June 23, 2011 9:06:36 PM

I'm not totally sure. I think when you hit "load default values" it probably loaded your BIOS defaults - changing your BIOS setting from "1333" back to "auto."

I think you should install all 8 GB, go into BIOS, change your RAM to 1333, run setup, just save values as they are (RAM at 1333), and boot. You may only see that "overclocking" message once.

Are you running any overclock?
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June 23, 2011 9:26:20 PM

Darn. This time I pressed F1 and ran the setup. Made sure it was at 1333, saved it. It rebooted and displays nothing again.

I have never overclocked nor noticed it in the BIOS.
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a c 207 Ĉ ASUS
a c 716 V Motherboard
June 23, 2011 9:33:22 PM

This is probably a Miss-Match issue or DIMM slot installation problem.

ref ASUS M4A77TD - http://usa.asus.com/Motherboards/AMD_AM3/M4A77TD/#downl...
4 x DIMM, Max. 16 GB, DDR3 1800(O.C.)/1600(O.C.)/1333/1066 ECC,Non-ECC,Un-buffered Memory

Q - Please provide a link to the 2x2GB set
Q - Please provide a link to the 2x4GB set
Q - What CPU?
Q - What BIOS version? {I recommend Version 2007 or 2104}

The reason we need the RAM information is see if the RAM is compatible and/or the CAS Timings, Voltage, Type including Brand can work together. Next 1600(O.C.) suggests the BCLK/FSB needs to be increased so the RAM remains stable and this is depended upon your CPU.

DIMM Slots:
CPU: | 2GB | 2GB | 4GB | 4GB |
CPU: | 4GB | 4GB | 2GB | 2GB |
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Best solution

a c 207 Ĉ ASUS
a c 716 V Motherboard
June 23, 2011 10:43:32 PM

1600 9-9-9-27 @ 1.65v KHX1600C9D3K2/8GX http://www.kingston.com/hyperx/products/khx_ddr3.asp
1600 9-9-9-24 @ 1.65v AX3U1600GB2G92G hoping Amazon has correct CAS; verify with CPU-z
=================
1600 9-9-9-27 @1.65v ; these are the mixed CAS Timings needed manually in the BIOS

CPU AMD Phenom II X2 555 ; this CPU can unlocked the cores, but not with your MOBO to my knowledge the new BIOS slight chance of having ASUS Core Unlocker.

BIOS 0305 ; yep time for a flashing use ASUS EZ Flash 2 and BIOS version 2104.

How to ASUS EZ Flash 2:
The USB Flash drive must be formatted in FAT-32.

Link -> http://vip.asus.com/forum/view.aspx?id=2007021522310966...
Video -> http://www.youtube.com/watch?v=NQKQj_aASCQ

Afterwards BIOS:
DRAM Frequency -> 1600 MHz
Memory Over Voltage -> 1.65v
TCL -> 9
TRCD -> 9
TRP -> 9
TRAS -> 27

If need you may need to OC CPU Bus Frequency -> 240 MHz.
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June 23, 2011 10:45:26 PM

Sink, the slots that you have the memory installed in are important, since you have differently sized sticks. Are you following your motherboard's instructions? Matching sticks should be in alternating slots (not next to one another). This is according to your motherboard manuals.

Have you tried different configurations?

As always, Jaq gives excellent advice. However, I respectfully disagree with setting your RAM to 1600. Get it working at 1333 before you do that.
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June 23, 2011 11:04:51 PM

I'm working on dinner right now, but afterward I'm going to update the BIOS. Never done that before. Nervous.

When I install the 2x4GB I take out the 2x2GB so I don't have mismatched sticks. Would it be advisable to use the 2x2GB with the 2x4GB or will that complicate things?

I have two black slots and two blue ones. Old RAM was black and in the two black next to one another. Tried the new blue RAM in those two slots and it didn't work, but they do work in the two blue slots. I have also tried them in every combination. 1122, 1212, 2121, 2211, etc.

Thank you all for your advice.
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June 23, 2011 11:13:32 PM

sinkingfast said:

When I install the 2x4GB I take out the 2x2GB so I don't have mismatched sticks. Would it be advisable to use the 2x2GB with the 2x4GB or will that complicate things?

I have two black slots and two blue ones. Old RAM was black and in the two black next to one another. Tried the new blue RAM in those two slots and it didn't work, but they do work in the two blue slots. I have also tried them in every combination. 1122, 1212, 2121, 2211, etc.

Thank you all for your advice.


I got slightly confused. :)  Sorry.

You should get the 2x4GB configuration working before trying to add the other two back in (which, obviously, you don't have to do if you don't want to). Either kit has a better chance of working in alternating slots. So try the 4GB sticks in (nothing - 4 - nothing - 4) or (4 - nothing - 4 - nothing).

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a c 207 Ĉ ASUS
a c 716 V Motherboard
June 23, 2011 11:27:31 PM

sinkingfast said:
When I install the 2x4GB I take out the 2x2GB so I don't have mismatched sticks. Would it be advisable to use the 2x2GB with the 2x4GB or will that complicate things?

During a BIOS Flash it would complicate the crap out the process, so whichever set is the MOST stable use that set.

Remember I'm not guaranteeing this mis-match will run properly, the settings I provided are the correct settings for 1600 MHz, and after it's all siad and done 1333 MHz or using one of the sets might be the outcome.

TIP: Prior to flashing the BIOS Load Defaults.

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June 23, 2011 11:39:00 PM

Will do. Currently the only setting I've ever changed in BIOS is the 1600 to 1333. Otherwise everything is on auto.
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June 24, 2011 1:09:10 AM

Put the BIOS on the USB. EZ Flash won't detect the USB. No option to select it, like it doesn't know it's plugged in. I've tried putting the USB in at various points. Before boot, before restart, while shut down etc...

I'm going to keep trying.
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a c 207 Ĉ ASUS
a c 716 V Motherboard
June 24, 2011 1:44:52 AM

It has to be a native USB port e.g. not USB 3, one of the USB ports directly off the back of the MOBO, FAT-32 formatted, and it shows-up as a HDD not USB drive.
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June 24, 2011 1:47:23 AM

Fantastic. Got it. The only step left is this:

If need you may need to OC CPU Bus Frequency -> 240 MHz.

But when I click CPU/NB Frequency the only options are:
Auto
800MHz
1000MHz
1200 MHz
1400 MHz
1600 MHz
1800 MHz
2000 MHz

Is this step necessary or can I manage without?

Again, thanks so much for tolerating this time consuming troubleshooting.
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June 24, 2011 2:22:28 AM

Ok. I went ahead and started it up without messing with the CPU Bus. It works perfectly and detects the 8GB. Wow. Thanks for all of your help. Wonderful.
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June 24, 2011 5:31:15 AM

Best answer selected by sinkingfast.
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June 25, 2011 12:17:36 AM

All have been helpful. It froze about 5 times today at 1600.

So I came back to this, "As always, Jaq gives excellent advice. However, I respectfully disagree with setting your RAM to 1600. Get it working at 1333 before you do that."

And set it to 1333. No freezing since.
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a c 207 Ĉ ASUS
a c 716 V Motherboard
June 25, 2011 1:25:15 AM

I've been waiting... It's nothing I did wrong.

Let me define what "Miss or Mix-Match" is it is the blending of 2 different kits with 2 different CAS Timings and or other characteristics. The blending settings are the correct settings, but with any "Miss-Match" there's no guarantees.

Also, I never recommend anyone purchase 2 different kits much less 2 different Brands. Density sure e.g. 2 kits: Kingston Ripjaws 2x2GB AND Kingston Ripjaws 2x4GB with the exact same Frequency, CAS and Voltage should work. However, but even then the only guarantees are from fully matched sets especially 1600 or faster 4x__GB sets if Dual Channel. The other notation was your CPU and it's ability to handle 1600+ MHz RAM.

Instead what you have is an experiment by the mix-match itself, and at best hoping for a good result.

You can choose 1333 MHz and 'SPD' default. Here's the problem, even at 'SPD' it may not work long-term.

You need to run at least 4-passes of Memtest next to check the stability and for ANY errors -> http://www.memtest.org/ using thr ISO/zip file create a bootable CD/DVD.

Good Luck!
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June 25, 2011 1:57:26 AM

I don't think he's actually using the 2 GB sticks right now. He's just running 2x4GB. (I think).

Still, no guarantee that will work at 1600 because, as you (Jaq) said, the CPU/IMC is not rated for 1600 MHz RAM. Getting RAM to run at 1600 is a bonus. :) 
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a c 207 Ĉ ASUS
a c 716 V Motherboard
June 25, 2011 2:06:57 AM

If he's not mixing then the CAS needs to be adjusted to the set and Frequency he's using.

And, yep there's no guarantees with the OP's CPU. The difference 1333 vs 1600 isn't much; 1~3%.

Also, if the BIOS is being set automatically fine, but if it's not then he'll need to look at the CPU-z SPD tab and use the CAS timings for 1333 MHz column and set the DRAM Over Voltage to Auto. Simplest is to Load Defaults/Optimized.
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