Precision M6800 questions and upgrades

[JadeRover]

Well that's just a number given by intel for the design TDP of these CPUs so that manufacturers can make heatsinks accordingly.

 

What is important is the voltage per clock ratio that each chip can do.

 

On my zbook 17 g2 with i7-4810mq, when pushing all core to 4.0Ghz it hits 70w.

 

It would be wiser to stay with the 4940xm that has much better silicon meaning you can undervolt more before you crash meaning higher clocks for the same power.

 

All haswell mobile quadcores have the same physical die (some with more cache than others), the way intel names CPUs is that those that can be fed less voltage (=less power) for the same clocks achieved are marketed as the XM chips.

 

For example, this same 4810mq will crash at -20mV at all core 4Ghz. The 4940xm has way better overclocking headroom than the 4900mq.

 

I'm ready to bet that the 4940xm reaches higher clocks than the 4900mq in your power limited system because you can get 3.7 Ghz all core @ -80mv witht eh 4940xm whereas the 4900mq will probably crash at -45mv = stuck at 3.5Ghz all core.

[SuperMG]

42 minutes ago, JadeRover said:

Well that's just a number given by intel for the design TDP of these CPUs so that manufacturers can make heatsinks accordingly.

 

What is important is the voltage per clock ratio that each chip can do.

 

On my zbook 17 g2 with i7-4810mq, when pushing all core to 4.0Ghz it hits 70w.

 

It would be wiser to stay with the 4940xm that has much better silicon meaning you can undervolt more before you crash meaning higher clocks for the same power.

 

All haswell mobile quadcores have the same physical die (some with more cache than others), the way intel names CPUs is that those that can be fed less voltage (=less power) for the same clocks achieved are marketed as the XM chips.

 

For example, this same 4810mq will crash at -20mV at all core 4Ghz. The 4940xm has way better overclocking headroom than the 4900mq.

 

I'm ready to bet that the 4940xm reaches higher clocks than the 4900mq in your power limited system because you can get 3.7 Ghz all core @ -80mv witht eh 4940xm whereas the 4900mq will probably crash at -45mv = stuck at 3.5Ghz all core.

I see people with Dell laptops reaching 4GHz all cores with the 4900MQ

[JadeRover]

And at what power did they achieve this do you know ? My guess is probably 60w+ to do 4ghz all core on the 4900mq as my 4810mq requires 70w to do all core 4Ghz and it's a tier lower.

 

Your problem is the power limit so I'd stick to the 4940xm

[SuperMG]

4 minutes ago, JadeRover said:

And at what power did they achieve this do you know ? My guess is probably 60w+ to do 4ghz all core on the 4900mq as my 4810mq requires 70w to do all core 4Ghz and it's a tier lower.

 

Your problem is the power limit so I'd stick to the 4940xm

But I don't wanna get power limited when both GPU and CPU work. It's better to get the lower TDP CPUs. I'll test the 4940MX in an Alienware and see if it does the same issue.

 

The 4940MX is requesting too much amps, maybe higher than the non extreme CPUs.

[JadeRover]

I don't think so, the 4940xm should beat the 4900mq at all power levels since you can undervolt it more than the 4900mq before your system crashes. If you are power limited for the whole system (which seems very unlikely with a 240w charger), the 4900mq won't perform as well as the 4940xm in any case.

 

Anyway if you ordered the 4900mq, give it a try and see if it can do more than 3.7 since that is your initial goal.

[SuperMG]

10 minutes ago, JadeRover said:

I don't think so, the 4940xm should beat the 4900mq at all power levels since you can undervolt it more than the 4900mq before your system crashes. If you are power limited for the whole system (which seems very unlikely with a 240w charger), the 4900mq won't perform as well as the 4940xm in any case.

 

Anyway if you ordered the 4900mq, give it a try and see if it can do more than 3.7 since that is your initial goal.

The 4940mx crashes at -110mV core so... Not a good chip maybe. I'll test on 17 R1

[SuperMG]

11 hours ago, JadeRover said:

I don't think so, the 4940xm should beat the 4900mq at all power levels since you can undervolt it more than the 4900mq before your system crashes. If you are power limited for the whole system (which seems very unlikely with a 240w charger), the 4900mq won't perform as well as the 4940xm in any case.

 

Anyway if you ordered the 4900mq, give it a try and see if it can do more than 3.7 since that is your initial goal.

I tested the 4940MX in the Alienware 17 R1 and... Shocking results... 

 

Max 71W in ThrottleStop bench instead of 58W.

 

CPU-Z: from 380 to 430 single score

Multi-thread: 1880 to 2200...

Can hit 4GHz on all cores.

 

I put the i7 4700MQ in the M6800, I get 2.3GHz on all cores, what?? Max 24W...

 

I set the cores to the lowest possible, I get 2.4GHz at 26W..... (Non OEM Battery) I didn't reset the CMOS and the NVRAM values yet. Maybe I should? I remember I was able to get 3.1GHz on all cores (OEM battery)

 

Edit: fixed the 4700MQ turbo with CMOS reset and got 3.4GHz on all cores at 58W max. Multi-thread is 1800 points

Edited Saturday at 10:19 AM by SuperMG

[DynamiteZerg]

On 2/11/2026 at 4:24 AM, Annihilator said:

 

i have 2x 8GB ripjaws V 1866 C10 in my M6800 n works perfect at that speed, they r same like hyperX, plug n play with the programmed speed. just waiting for my 4x 2133 to arrive, got a set for around 150 bucks + shipping, isnt cheap but will push the CPU limit another 2-5% up, depends which game 😄 

Where did you get the 2133 rams?

[Annihilator]

6 hours ago, DynamiteZerg said:

Where did you get the 2133 rams?

ebay usa

[DynamiteZerg]

12 minutes ago, Annihilator said:

ebay usa

You lucky man. They are extremely rare these days. 

[SuperMG]

31 minutes ago, DynamiteZerg said:

You lucky man. They are extremely rare these days. 

No you are lucky for having a potential ZRT RTX 4090 VBIOS.

 

For M6800 I think 135W TDP should be the max for dGPU. 150W works but needs beefy PSU.

[Annihilator]

5 hours ago, DynamiteZerg said:

You lucky man. They are extremely rare these days. 

 

yeah i know, was a daily seach on ebay to be the first... still dont know will keep both(7720 n 6800) or sel the 6800 when finished it. 🤪 but need to calculate what i paid for all those stuff... the 6800 itself was a bargain with only 100 bucks, but all those stuff i putted in its around 600 bucks, dont know will get those for it.

[Nowan]

330W power adapter works on m6800?

[DynamiteZerg]

56 minutes ago, Nowan said:

330W power adapter works on m6800?

Of course. Why wouldn't it work?

[DynamiteZerg]

On 3/29/2026 at 8:30 AM, Annihilator said:

 

yeah i know, was a daily seach on ebay to be the first... still dont know will keep both(7720 n 6800) or sel the 6800 when finished it. 🤪 but need to calculate what i paid for all those stuff... the 6800 itself was a bargain with only 100 bucks, but all those stuff i putted in its around 600 bucks, dont know will get those for it.

I will keep searching eBay from now on!

 

@Annihilator What's the key search words that you used?

[DynamiteZerg]

Ok, the 4090 mobile card that I got does indeed look like a ZRT not look like a ZRT and is instead a X-Vsion card. I've used the CH341 bios programmer to download a copy of the vbios for @SuperMG and he has confirmed from the vbios extract as well.

 

Work meeting ended a bit late. I will install the card tomorrow and test it with the Optimus M6800.

 

I am no longer testing the card in the LVDS M6800 as I was also intending to deploy it in a eDP M6800 which is now not possible without the EDID hack. I have initiated for a full refund and return of the card with Taobao. Unless the seller really confirms that he has a ZRT version with proper pictures and video to backup his claim, if not I'm not getting the 4090 from him anymore. I will instead deploy the P5200 to the eDP M6800 I am building. @SuperMG the P5200 will work with the eDP M6800 right?

 

*Edit: On closer look, it is an X-Vsion 4090 MXM card and not a ZRT version. It is going against the confirmation by the seller and I have initiated for a full refund.*

[SuperMG]

14 minutes ago, DynamiteZerg said:

Ok, the 4090 mobile card that I got does indeed look like a ZRT. I've used the CH341 bios programmer to download a copy of the vbios for @SuperMG

 

Work meeting ended a bit late. I will install the card tomorrow and test it with the Optimus M6800. 

The vbios version is the same as XVSION!!! You sure it's a ZRT design you got?

 

By comparing the back side of the PCB you sent me. I compared it with ZRT and X-VSION models. Sadly, they got you... You got the X-VSION one which isn't the one that was advertised in the TAOBAO listing

Edited 17 hours ago by SuperMG

[Nowan]

19 hours ago, DynamiteZerg said:

Of course. Why wouldn't it work?

i didnt think there was no restrictions of power adapters over 240w is possible for m6800 maybe m6600 n m6700 also? it can be any dell 330w adapters?

 

[Aaron44126]

3 hours ago, Nowan said:

i didnt think there was no restrictions of power adapters over 240w is possible for m6800 maybe m6600 n m6700 also? it can be any dell 330w adapters?

 

You can use a 330W adapter and it will work (any Dell adapter with the right connector on the end), but it is not going to pull the full 330W. Just like how you can plug one of the Precision 240Ws into a Latitude with integrated GPU and it will "work", but it won't pull nearly 240W.

 

Past experiments with this era of systems have shown that it doesn't really give you any "benefit" over 240W. It might be helpful if you are using one of these >100W aftermarket GPU upgrades, if there isn't something in the system that would cap the power going to the card. It would be interesting to have some comparison benchmarks.