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Wierd Problem Here! I recently added a 900SLK-a and a 92mm Enermax adjustable fan to my AN35N running a Barton 2500+ at 12*175. At about this time I started having problems with my USB modem. It became increasingly difficult to connect to the ISP. Once connected it would work ok but getting there was a real pain.
Also at about this time, we experienced telephone problems. AH HA!! Call the phone company. They found some internal wiring problems but no issues on the incoming service AND no issues on the line serving the modem.
Last night I bought a new modem...USB. Hooked it up and immediately started having the exact same connection problems as the previous USB modem.
I have noticed that Speedfan and BIOS are reporting 3.3V rail as being between 3.07 and 3.10. This wasn't a problem before the 900 and Enermax. But doesn't the HSF run off the 12V line???
FINALLY MY QUESTIONS 1) Are there issues with the USBs on the AN35N? 2) What runs off of the 3.3V rail? 3) Would a PCI modem run into these same problems? 4) Should I run the Enermax off of a PSU Molex instead of the Mobo header?
Any help with this situation would be greatly appreciated! I'm stumped. Thanks! CoachB
P.S. Here are my specs so you get a better picture: AN35N Ultra 400 Barton 2500+ Unlocked (12*175) Crucial PC2100 512MB Antec 300W PSU Asus Ti4200 GPU 900slk-a w/Enermax 92mm fan WD800JB HDD Lite-on CD-RW USR external USB modem
Posts: 41 | From: Music City, USA | Registered: Nov 2004
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Hi Coachb and a big welcome to the Rebels' Haven!
Hopefully some of our Shuttle experts will be a along presently to cast their views... I'm a Shuttle noob myself! All I can say is that I was always wary of running extremely powerful fans off the mobo header with other systems, but whether there's any validity in being that cautious I'm not sure... and whether stressing the header would cause a drain on the USB supply I can't imagine.
I'm currently running my Shuttle set-up off a 300W PSU on the grounds there's only one HDD and one optical drive, but I begin to wonder if 300 watts is enough. However, you would expect very solid rails from an Antec unit...
-------------------- Epox 9NPA Ultra, Athlon 64 3200+, 1GB Patriot PC3200 XBLK, 2x120GB Maxtor HDDs, Leadtek 6600GT Extreme, Liteon DL DVD-RW, 550W Antec PSU, XP Pro SP2 Posts: 1106 | From: UK | Registered: Jun 2003
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No issues with USB on the AN35 that I know of. You have a lot of power using devices in your system. Especially the Ti4200 vid card. I believe your 300w PSU is way to small. As for the 3.3v rail being low, PSU's work from a total combined output of the rails. For example, if you put more on the 12v rail than it's rated to handle, it will rob from another rail causing it to be low. I don't know if a PCI modem would draw more or less power than a USB modem, but I don't think that would cure your problems anyway. As for the Enermax fan, anytime I use a fan other than stock coolers that come with processors, I use an adapter to plug the fan into a molex connector that has a separate plug going to the mobo's connector for the rpm sensing. When using a fan that has a higher current draw, I just feel that the heavier wiring of the PSU's molex connectors would be less likely to have problems than the thin traces of the mobo. Still, I think your problem is just an undersized PSU. Inexpensive replacements I would suggest are the Enlight 420w or the Thermaltake 420w. I've been eyeballing this Rosewill 450w at newegg that boasts some nice ratings on the rails.
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OldandFast & Hal, Thanks for the quick replies! I'm tickled to get a reply from O&F. I've been a lurker here for a while and have learned so much from his "experimentation". Hal, I'll keep you posted as to the outcome so we 'noobs' can learn together.
Anyway, I strongly suspect the Enermax has pushed my little PSU to the edge as you suggest. I am going back to the stock HS and F tonight to see what happens. Temps aren't nearly as good but at least things ran properly. I'm still able to stay around 55C full load...47C surfing. If things settle down, I guess I'll have to go PSU shopping 'cause I like the temps I get with the Enermax/900SLK.
Maybe I can ask Santa for a PSU and some PC3200, hehe. I HAVE slowed down on the drinking and carousing lately! CoachB
BTW, I know I've read it a dozen times but it is beginning to sink in....OCing is more than just a few BIOS tweaks.
Posts: 41 | From: Music City, USA | Registered: Nov 2004
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try the red tagan,28 on teh 12v and like 50 bucks
-------------------- shuttle an35n-u @ 250fsb 2400-m @ 2.5 swaping vid cards several wd hdds chieftec case with several 120mm fans keeping it cool Posts: 53 | From: mtl,qc,canada | Registered: Jun 2004
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Update! Removed Enermax fan, replaced Ti4200 with GeForce 2MX, disconnected all case fans, restored Multi, FSB, Vcore & Vdimm to stock. All this made very little (insignificant) difference in voltage readings AND modem problem still exists.
The computer recognizes the modem just fine. Modem diagnostics in Device Manager say all is well. Device Manager shows no conflicts. Hyper terminal works well. Modem is initialized, gets dial-tone, and dials clearly and strongly. BUT, when the "handshake" part takes place all heck breaks loose. I think the comp and modem are getting along fine.
I even tried connecting to the outside jack with a long handset cord. Problem symptoms still existed but I was able to connect every time. It is looking more and more like I still have a Telco problem even tho the tech they sent out said everything was fine.
Sure wish I could justify cost of Cable!!! CoachB
Posts: 41 | From: Music City, USA | Registered: Nov 2004
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I may be misunderstanding what you're trying to say but you seem to be associating USB with the 3.3v rail when infact USB draws power from the +5v rail.
Posts: 6 | From: Richmond | Registered: Nov 2004
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RVWinkle, You are reading me pretty well. The only voltage that looks suspect is the 3.3V rail. It runs between 3.17 and 3.07 depending on hardware configuration. The 5V rail stays between 5.0 and 5.05. The 12V rail stays between 11.7 to 11.9.
Basically, I'm grasping at straws to try to determine why modem function has taken a header.
I had two or three things that occurred close to the time that connection ability went south. 1) Discovered 110V AC coming in over the telephone line. 2) Installation of 900SLK and Enermax Fan 3) House phones went on strike
Phone Co. agreed to buy a new modem. It has same problems as old modem altho a different brand. One possibility that has been suggested is that incoming voltage on phone line may have affected motherboard. I don't know how to determine if this is the case, however, I don't see how significant voltage can get thru an external USB modem and into the mobo (at least enough to bollux everything).
If the mobo has been compromised, I may need to return the new modem and get the Telco to replace the mobo instead. Any suggestions on how to tell??? Thanks of your input BTW! CoachB
Posts: 41 | From: Music City, USA | Registered: Nov 2004
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