Precision M6800 questions and upgrades

[Bublik]

Hi SuperMG,

How did you enable Above 4G decoding? I thought all GPUs starting with Ampere needed it in the sBIOS. Is there a solution for this?

[SuperMG]

4 hours ago, Bublik said:

Hi SuperMG,

How did you enable Above 4G decoding? I thought all GPUs starting with Ampere needed it in the sBIOS. Is there a solution for this?

No need to enable it. Ampere and Ada cards work on M6700 and M6800, in eDP, in pure-UEFI, no Legacy options. 

 

It depends on the vbios but mine did have 4G decoding but it wasn't obligated.

[SuperMG]

On 3/31/2026 at 2:13 AM, Aaron44126 said:

 

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.

Hello. So 330W will fully work (past 240W) if we use a 150W MXM card? 

 

I get orange blinking in 3DMark TimeSpy but the performance doesn't throttle. I use an old 330W Dell PSU + FV993 battery.

 

I think the motherboard is cooked, the charging IC part, it doesn't charge. I got the laptop as parts, it had a BIOS lock and I didn't test anything before doing the big upgrades. I bought a new Dell 330W PSU after but I've the same issue, no charging.

 

I bought 2 eDP motherboards after and I'll test one of them. (140€ for 2)

[Aaron44126]

24 minutes ago, SuperMG said:

Hello. So 330W will fully work (past 240W) if we use a 150W MXM card?

 

Cannot confirm. Have not tried it personally. I have heard multiple stories of users trying 330W in "regular" hardware configurations and it not offering any benefit over 240W at all. But stock configurations are hard to push past 240W power needed just for compute. So what I was going for is something like: if there is any chance that >240W will get you some benefit, you'd have to be using an aftermarket high-power GPU.

 

If the system isn't charging, I doubt that it is the PSU's fault. The system should charge even with a 90W adapter (maybe even less) if it is powered off. I see you have new motherboards on the way to test, but there's also a chance that it could just be the battery going bad?

[SuperMG]

26 minutes ago, Aaron44126 said:

 

Cannot confirm. Have not tried it personally. I have heard multiple stories of users trying 330W in "regular" hardware configurations and it not offering any benefit over 240W at all. But stock configurations are hard to push past 240W power needed just for compute. So what I was going for is something like: if there is any chance that >240W will get you some benefit, you'd have to be using an aftermarket high-power GPU.

 

If the system isn't charging, I doubt that it is the PSU's fault. The system should charge even with a 90W adapter (maybe even less) if it is powered off. I see you have new motherboards on the way to test, but there's also a chance that it could just be the battery going bad?

No, I tested with 2 batteries. Same results. One is a new aftermarket (Kingsener) one that charges on M6700 and one that's OEM that charges on M6700 as well.

 

None charges with the M6800. I was able to get 154W in the MXM slot too, no power cuts, no throttles.

 

4080M: 16000 GPU scores in TimeSpy. 260-270FPS in Heaven benchmark 4.0 1080p Ultra.

 

 

I don't think the load on the MXM made the charging IC goes bad.

 

Otherwise the whole power rail would be failing and the laptop won't power on.

Edited 13 hours ago by SuperMG

[SuperMG]

33 minutes ago, Aaron44126 said:

 

Cannot confirm. Have not tried it personally. I have heard multiple stories of users trying 330W in "regular" hardware configurations and it not offering any benefit over 240W at all. But stock configurations are hard to push past 240W power needed just for compute. So what I was going for is something like: if there is any chance that >240W will get you some benefit, you'd have to be using an aftermarket high-power GPU.

 

If the system isn't charging, I doubt that it is the PSU's fault. The system should charge even with a 90W adapter (maybe even less) if it is powered off. I see you have new motherboards on the way to test, but there's also a chance that it could just be the battery going bad?

I forgot one thing. When I plug any PSU, 240W or 330W when the laptop is shutdown.

 

The charging led doesn't come on, if it was charging, it'll light up.