fineyoungknives Posted November 6, 2006 Share Posted November 6, 2006 Hi Ram Guy, I built a fleet of Shuttle SN27P2 (from barebone) systems. I used 2GB kits of CM2X1024-6400. I set the timings to 5-5-5-12 like it says right on the stick! It's an AMD Athlon64 X2, 4600+, AM2, nVidia nForce 570 chipset. I've been experiencing some random bluescreens. Very very random. The minidump analysis indicates they are related to the USB bus. (Windbg says "Probably caused by : usbohci.sys ( usbohci+18f3 )") My memory appears to pass memtest with flying colors, and the issues happen all over my fleet of systems, so I don't suspect a bad module or anything like that. I've got the latest updates and drivers and hoopajoops I can possibly think of and am fairly convinced at this point this this is not a software problem. (I've been at this for a while!) My question is: Is there some different/safer timings/settings for my RAM you might suggest I try to dispatch these BSODs on my Shuttle SN27P2s? (Or any other suggestions would also be happily recieved!) Thanks, -Michael Link to comment Share on other sites More sharing options...
Yellowbeard Posted November 7, 2006 Share Posted November 7, 2006 Does the Shuttle bios allow you to adjust the memory voltage? If so, make sure it is in the 1.9v to 2.1v range. 2.1v is safe and within warranty spex. Link to comment Share on other sites More sharing options...
fineyoungknives Posted November 8, 2006 Author Share Posted November 8, 2006 soooooo the best advice I can get is to crank up the voltage? What about the fact that I find like 3 different documented timings for these modules? 5-5-5-12, 5-5-5-15, 5-5-5-18... which one is the safest? See, I'm on-site and everytime this crashes it means I have to stay another day in the middle of nowhere, Indiana. Every guess I make means I have to stay one more day to make sure it's stable. I'm eager to resume my bostonite lifestyle and would rather test one of these options than all three. Is there a science behind "crank up the voltage"? Or is that the memory equivilent of "uhhh defrag your hard drive". Link to comment Share on other sites More sharing options...
Yellowbeard Posted November 8, 2006 Share Posted November 8, 2006 PDF PC6400 5,5,5,12 timings are what the module is designed to run. The SPD is programmed at 5,5,5,15 which is JEDEC spec. The SPD is programmed to JEDEC spec to allow the memory to boot in any system. If you want to run the modules at their rated timings, set them to 5,5,5,12 manually. Either is safe. And yes, there is a logical reason to bump the voltage. Different MOBOs can and do have different types and quality of power and voltage regulation fo rth memory. Also, your choice of PSU can play into this. So, if you are having problems related to the memory, raising the Vdimm can increase the signal strength to the memory. This often helps with stability issues. And, 2.1v is safe with the memory you have and within warranty spex. For a quick link to the PC6400 spex, click the link in my signature, What Are the Correct Timings for My Memory. Good luck in a speedy return to the land of tea parties and clam chowder. Link to comment Share on other sites More sharing options...
Yellowbeard Posted November 8, 2006 Share Posted November 8, 2006 Oh, what power supply are you using with these machines? I am assuming it is the stock Shuttle. Can you find the spex on it? Link to comment Share on other sites More sharing options...
Yellowbeard Posted November 8, 2006 Share Posted November 8, 2006 And, what is connected to the USB bus during operation? If it is a USB keyboard and mouse, do can you try PS2? Link to comment Share on other sites More sharing options...
fineyoungknives Posted November 8, 2006 Author Share Posted November 8, 2006 Ok, thanks for that explanation. It looks like the BIOS lets me go up to 2.0 volts. It is a 1.9 now. I will make this change. Yes I'm using the stock Shuttle SN27P2 power supply. It's a 400 watt power supply.http://global.shuttle.com/Product/Barebone/SN27P2-Spec.aspIs there more specific information than that you've got your eye on? There is no keyboard or mouse plugged into these machines at all. They are purely network stations. I do have an FTDI-based USB-to-serial adapter plugged into USB. I really need it, can't ditch it. I'm using the latest drivers for this which are WHQL signed. Thanks,-Michael Link to comment Share on other sites More sharing options...
Yellowbeard Posted November 8, 2006 Share Posted November 8, 2006 Unless you have a power hungry video card, the PSU should be fine. Based on your mini dump error, I'd suggest pulling 1 machine out, and torture testing it with a mouse and keyboard and without your USB to serial adapter. My trouble shooting thus far has been from a memory+config+stability standpoint. However, your dump error and config has me concerned that it might be that adapter or error relating to it. Link to comment Share on other sites More sharing options...
fineyoungknives Posted November 8, 2006 Author Share Posted November 8, 2006 I got a fella from Shuttle on the horn. With his help I was able to upgrade to the U version of the BIOS (was stuck at the M version before, wouldn't flash, long story). The U version adds a 1T/2T option. Which should I choose? The "What are the correct timings for my module" thread doesn't seem to indicate this for CM2X1024-6400. Link to comment Share on other sites More sharing options...
Yellowbeard Posted November 8, 2006 Share Posted November 8, 2006 If there is an AUTO or whatever the MOBO defaults to, I'd go with that. If you want or need to set it manually, I'd suggest 2T. Hopefully the bios will resolve this for you, it sounds like fun :roll: Now you get go flash the bios on yer new fleet. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.