M4800 Owner's Thread

Pretty sure both the 1800p and 4K models had Optimus locked out. This system could only do Optimus if you had an LVDS display. (Could be wrong but that's my recollection... doesn't really make sense either if the 4K panel can do Optimus but the 1800p panel cannot?)

 

Gettin' cobwebs in the brain in my old age...did some googling and you're totally right. Sorry for misremembering.

I'd rep you, but I have to spread it around to some other before they'll let me...

 

The beast is back! Motherboard replacement went with out an hitch. It definitely more intimidating then it looks. Ran the diagnostic test as well and everything pass as well. Manual was great

https://postimg.cc/bskftvpy




I have one question though, what is the average temperature for this particular laptop?
I may have put too little terminal compound. While idle is around 50 - 57C
Under stress can get to 80's

Wasn't able to get a temp reading before swapping the boards.

Thanks,
Dan

 

I'll say that my Precision M6700 operates in this range.

 

Perfect! thanks for the reply, it seems like I'm finished for now.
The temps don't seem too wild, if I saw 90+ I would panic

 

Well, I got my new monitor (Samsung UR55), and so far everything appears to be working perfectly, in the following configuration:

• Main monitor (UR55), 3840x2160@60hz, connected to m4800's DisplayPort
• Right monitor, 1920x1080@60hz, connected to dock's DVI-1
• Left monitor, 1920x1080@60hz, connected to dock's DVI-2
• Laptop's FHD panel, disabled (lid closed while docked).

I was wrong about the maximum bandwidth available for DisplayPort 1.2... according to Wikipedia, DP1.2's total bandwidth is 21.6gbps.

• 3840x2160@60hz = 12.54gbps
• 1920x1080@60hz = 3.20gbps

12.54 + 3.20 + 3.20 = 18.94gbps, so there's no apparent problem driving all three monitors at 60hz.

At this point, I'm feeling pretty confident that there's almost UNQUESTIONABLY a proper DisplayPort 1-to-3 hub grafted onto the K2100m card. Otherwise, there's really NO WAY my present configuration could actually work. If the m4800's DisplayPort were shared with DVI-2/DP-2 on the dock, using an internally passive DP-DVI adapter to drive a monitor via DVI-2 on the dock would clobber the monitor connected directly to the m4800's DisplayPort (since passive adapters are only allowed when it's the one and only display on the port).

Digging deeper, it looks like I could POSSIBLY even get away with upgrading ONE of the side monitors with a 2560x1440 display, though I might also have to upgrade the dock to the newer USB 3 version if 2560x1440@60hz outstripped what the USB 2 version's DisplayPorts can handle:

• 2560x1440@60hz = 5.63gbps
• 12.54 + 5.63 + 3.20 = 21.37gbps... just under the limit, with 0.17gbps to spare

... but I'm not really sure just how dangerously I'd be pushing my luck in that scenario.

I suppose if push came to shove, I could either force DVI-1 to use Optimus or go back to using the laptop's internal FHD panel as my third (left) screen, since either option would remove display #3 entirely from DP1.2's link budget.

Pushing my luck even harder, I'm wondering whether I could ultimately drive TWO 2560x1440 monitors at 60hz along with the 3840x2160 monitor at 60hz by intentionally driving one of them via Optimus. This would probably be risky unless I could borrow monitors from friends to try first (or could return the monitors without penalty), because I'm a lot less confident that it would work. Not only would this scenario outstrip the bandwidth of DP1.2, it would probably ALSO approach (if not blow past) the absolute limits of what the K2100m can drive (via DP, Optimus, or both).

Yeah, I'm out of control. Now that I'm seeing 4k and 2k side by side, 1920x1080 @ 24" looks AWFUL by comparison ;-)

 

Hello all,

I'm looking into possibly upgrading the MXM GPU, right now I'm using a Quadro K1100M which has a lot to be desired. Any suggestions or recommendations?

Thanks,
Dan

 

My suggestion are NVIDIA Maxwell based GPUs and in my opinion the Quadro models have a better availability and price tag.

Maxwell Quadro GPUs working flawlessly in M4800 (order high to low in meaning of power): M2200 > M2000M >= M1200 > M1000M >= K2200M

Edit 1: In any case a very simple edit of the NVIDA driver inf file is necessary to use the appropriate driver.

Edit 2: Search for Dell or HP MXM 3.0a cards (small footprint)

 

Thank you for the reply! Will take a look at the different cards. I believe the best place to buy these would be on eBay?

Thanks,
Dan

 

I just got today a Quadro m2200 for my m4800 with 4k display, the upgrade was as easy as it gets, just plug and play, i didn't even had to modify the drivers, im really happy with how easy it turned out to be!