Latitude E6430 CPU upgrade to Core i7-3740QM - machine not seeing all cores.

The latest BIOS is here:

https://www.dell.com/support/home/en-us/product-support/product/latitude-e6430/drivers

That said, this system never shipped with any quad-core CPUs -- it may well be that you won't be able to use all four cores of the processor, even with the latest BIOS update.

There's more to supporting four cores than just the BIOS -- the board and its voltage regulators need to be designed for that, which this model never was.

hello

Do you fix the issue , win10 see all 4cores?

I have the same laptop,  latitude E6430 with i5-3340M  and I wanna upgrade the cpu w/ an i7-3740QM.

if all work good and got you 4cores  working  is the i7-3740QM  running hotter  or no issue there?

thank you

Welcome to the Dell Community @dellidell 

Installed the 17-3740QM and updated the BIOS to A24.

All cores are running just fine.

Temperature increase is negligible.

Best regards,

U2

A couple restarts on battery and the system recognized all four cores. 
Temps are high, but not much higher than the Core i5. However, it hits 100-105 C under load (Cinebench, Prime95). Real-world load (big compiles, big spreadsheets, Minecraft), it hovers around 90 C. 
note that the heat sink array for the Core i7/NVIDIA model DOES NOT FIT in the Core i5 model chassis. I learned that the hard way. 
I use Throttlestop to keep the CPU at 87.5% max, and temps stay in the low to mid 80s C under load now. Not too much hit to performance as I think the chip was thermal throttling anyway. 

so you said is better to stay with my i5 3340m ?

https://www.cpubenchmark.net/cpu.php?cpu=Intel+Core+i5-3340M+%40+2.70GHz&id=1889 2753 points

https://www.cpubenchmark.net/cpu.php?cpu=Intel+Core+i7-3740QM+%40+2.70GHz&id=1481  5633 points

it should be a  increast in performance

I don't have dedicated video card on this laptop

@dellidell 

I also added a dab of paste to the other chip when I removed the i5-3340M [TDP 35] and installed the i7-3740QM [TDP 45] today.

I left the laptop doing Windows updates as the image I had was from 7-12-19.

I should have performed a bench test before I upgraded the CPU!!!

Looking at the upgrade to the i7-3740QM it should be a  significant increase in performance???

https://www.cpu-upgrade.com/CPUs/Intel/Core_i5_Mobile/i5-3340M_(PGA).html

I also have a few Core i7-3940XM to try but the upgrade chance is only 24% and the TDP is 55, I just don't think it is worth trying???

Regards,

U2

 I do see that the  heat sink  taping the  other chip  from the mobo

temp on i5 3340M  at 100%  with heavyLoad software running for 10min is reaching   80-82C (with a fresh  thermal paste added on both chips cpu and  the other one that the heat sink is touching  in  the  lower corner

my plan is to use this laptop like a bitcoin node   8gb ram 1terra hdd and  a quad core cpu like i7 3740qm will be much better than i5 3340m 

But I wanna know  if i7 3740qm will bring double horse power  than the i5 3340m