Couple of questions about fans and 4900MQ.

Hey guys. I have been browsing this forum for a couple of months now. I own a M18xR2 and now a FREE 18. After reading all the issues with the 18, and experiencing them first hand, I'm wondering if it's possible to rewire the fans on the 18 so that they will constantly be on max blast. If I'm not mistaken, the fans have 4 wires total. 2 -/+ for the power and 2 which control the speed. If the 2 that control the speed are disconnected, would the fans by default be getting max power? If so, would that work as a temp fix, or did Dell make the fans REALLY messed up aside from the fan tables.

My build:
4900MQ OC'd to 4.0. Actual max with turbo is about 3.59. I have read http://forum.notebookreview.com/ali...w-overclock-4930mx-4-3ghz-messed-up-bios.html and been experimenting only to end up bricking my system twice. Getting my 3rd mobo replacement today. Tried everything on this forum to reset bios, aside from 4700mq cpu method. Nothin worked. Owned the laptop since Dec 26... ._____.
32GB ram @ 1800Mhz
Dual 780's.
250 GB SSD for windows. This isn't in the SSD slot, it's taking up my 2nd HD slot... What the heck.
750 7200rpm HDD for all other crap.
Will be getting the technician to re-paste everything with Arctic Silver.


TLDR;
If 2 wires from the fans are to be removed, will they run at full blast? I'm under the assumption that HWiNFO isn't compatible with the new systems yet.
If the fans are running at full blast successfully, will the CPU and vid cards be getting enough power to run like they are supposed too?
For those of you with a 4900MQ OC'd version, any of you capable of running it close to 4.0-4.2 GHz assuming the temps stay below 90°c?


By the way, if they questions have been answered, I'm very sorry for posting this useless thread.

Edit: Does anyone have a copy of the alienware 18 mobo schematics? I found this: http://notebookschematic.com/?p=22852 except I'm too cheap to pay $14 for it just to know how the fan's wiring...

 

You can't overclock a 4900MQ anywhere near what you can a 4930MX. The 4900MQ is locked. It normally comes (out of box) at 3.8GHz, but Alienware overclocked it to its near maximum already at 4.0GHz. You'll never achieve a stable overclock higher than 4.1GHz on the 4900MQ. I suggest you stop trying if you're burning up the motherboard in attempts to do so.

EDIT: By the way, the performance "gain" of 200MHz is negligible. It's not even worth the effort.

 

Keep and upgrade the r2

Sent from my SM-N900T using Tapatalk

 

Yes I believe the fan will run at max speed if the tach and PWN is disconnected, unless there is some stupid programming saying the fan is faulty (no tach).

I will test this soon as I will replace the CPU fan.

 

I'm not a crazy benchmark chaser. Atleast I want this thing to get the 4.0 Ghz that was advertised. I'm simply having issues finding a stable setting.

@Dandan112988 I actually prefer the look and feel of the 18 compared to the R2. I'm aware that the R2 is THE king.

@gqman69 Let me know how this goes. If I can keep my 18 from bricking again, and once I find some stable oc settings, I'll be screwing with the fans as well. If the AW engineers refuse to fix this issue, we'll just have the fans on max all the time. Muahahahahahaha!

 

I take it you mean running all 4 cores at 4.2. What does ThrottleStop show your power at and TDP throttle when running max?

 

I'm sorry, but I have no idea how to opperate ThrottleStop. Everywhere that I saw TDP, it was grey.

 

Just run it in monitoring mode and monitor the boxes shown below.

 

Shortly after taking this screenshot, laptop crashed P_P

 

Okay, that shows you are indeed power throttling so you need to increase your limit. Secondly you seem to be running default voltages, these can usually be decreased to lower power consumption and give a bit more temperature headroom of which you don't have a lot of. Thirdly you are using the unlocked multipliers without any additional voltage, IOW your 44x multiplier when activated is trying to run at the same voltage as the 38x multiplier so it's not surprising you are experiencing instability, that is unless AW is doing something funky with the EC and voltage control.

 

I'll be away from my 18 for atleast another 7 more hours. When I get home I'll try to play with some settings. Nothing seemed to work yesterday. I'd get a BSOD non stop. Maybe I'm not adjusting it correctly.

 

Can anyone confirm is this wiring diagram is applicable to the Alienware 18? I don't have a multimeter so I can't test it out aside from cutting the wires and checking what happens.

 

I got it. Will post a tutorial on how to make CPU fan work on max. My current idle temps are less than 40 in a 28deg apartment.