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Looking to upgrade CPU of my L702X laptop

post #1 of 20
Thread Starter 
I am trying to upgrade my laptop to the Intel Core i7 3840QM but the computer store says my laptop doesn't support this processor and doesn't want to sell me it.
Currently I am using the Intel Core i7 2630QM in my L702X XPS 17 laptop with 3D support.
I have found in a closed dell topic that it worked for some guy, but would like to have someone confirm this on these forums.

Both CPU's have the same socket, and both have 45 W Max TDP. I don't see why it wouldn't be supported.

Originally from the DELL customer forums
"
Reply Posted by shan383 on 15 Dec 2013 6:16 PM:
After I replaced the CPU I got blue screens and had to reinstall windows which fixed it.. Other than that I have not had any other problems with it but the performance was not dramatic. I would recommend this upgrade only if the processor cost under 200$ any more that that it not worth it. If you haven't already upgrade to an SSD there is a much greater increase in performance after that.
"

Could anyone confirm why it is or is not possible to do this upgrade?

CPU-Z dumps:
http://puu.sh/7UhKx.png
http://puu.sh/7UhKG.png
http://puu.sh/7UhKZ.png
http://puu.sh/7UhLq.png
post #2 of 20
because one is sandybridge and the other is Ivybridge, might work with a BIOS update but it's probably not recommended...

If it were a PC rather than a laptop yeah, that wouldn't be an issue.
post #3 of 20
Quote:
Originally Posted by jacky452 View Post

I am trying to upgrade my laptop to the Intel Core i7 3840QM but the computer store says my laptop doesn't support this processor and doesn't want to sell me it.
Currently I am using the Intel Core i7 2630QM in my L702X XPS 17 laptop with 3D support.
I have found in a closed dell topic that it worked for some guy, but would like to have someone confirm this on these forums.

Both CPU's have the same socket, and both have 45 W Max TDP. I don't see why it wouldn't be supported.

Originally from the DELL customer forums
"
Reply Posted by shan383 on 15 Dec 2013 6:16 PM:
After I replaced the CPU I got blue screens and had to reinstall windows which fixed it.. Other than that I have not had any other problems with it but the performance was not dramatic. I would recommend this upgrade only if the processor cost under 200$ any more that that it not worth it. If you haven't already upgrade to an SSD there is a much greater increase in performance after that.
"

Could anyone confirm why it is or is not possible to do this upgrade?

CPU-Z dumps:
http://puu.sh/7UhKx.png
http://puu.sh/7UhKG.png
http://puu.sh/7UhKZ.png
http://puu.sh/7UhLq.png

it maybe possible but the manufacturer of the computer would have to release a bios to support the new processor which most likely isn't the case. the processor you have now is plenty sufficient, I don't see a logical excuse to replace a processor in a laptop. An ssd would be far less risky and would provide the most noticeable performance boost. I do not have any definitive answers for you, only my past experience and common sense. but laptops are generally NOT made to upgrade the hardware in them aside from replacing with identical parts that may go bad.
post #4 of 20
Thread Starter 
I am using a unlocked and custom upgraded A19 bios by captainkaisar:

http://forum.notebookreview.com/dell-xps-studio-xps/641688-l702x-modded-gpu-bios-18.html
post #5 of 20
Probably wouldn't have the full instructions for running the Ivybridge processor tbh

Ask him, if not, then you can't use it.
post #6 of 20
Thread Starter 
I actually already use the samsung 840 Pro SSD; but i want to build an uber laptop ;o

Also take a look at this topic which I found on the dell community:
http://webcache.googleusercontent.com/search?q=cache:Jtr_7Eor5HcJ:en.community.dell.com/support-forums/laptop/f/3518/t/19515684.aspx&hl=en&strip=1

*edit*
I have posted a reply asking whether the BIOS supports ivy bridge cpu.
I'll let you guys know if I find out any more information.
Edited by jacky452 - 4/3/14 at 6:58am
post #7 of 20
Quote:
Originally Posted by jacky452 View Post


I have posted a reply asking whether the BIOS supports ivy bridge cpu.
I'll let you guys know if I find out any more information.

Let us know if you get reports of it supported on the other forum. It would be a good bragging topic to say you pulled it off but in my personal opinion i don't think it is worth the trouble.
Did the store you went to give a specific reason of not being supported? such as not the same hardware socket or just not officially supported?
post #8 of 20
Thread Starter 
Okay so I have received some replies from capitankasar, he seems really pro at this stuff:

Quote from capitankasar:
Code:
@jacky452

nope

ivy bridge cpus need intel ME version 8, L502X and L702X have version 7

we tried to update the ME firmeware to version 8 without success, also even we had success updating it, there would be no guarantees it would work due posible chipset or BIOS limitations.

I would be really surprised if that is right (running a ivy bridge cpu on a sandy bridge motherboard, specially the HM67 mobile chipset present into the L502X and L702X wich have officially no support for ivy)

http://forum.techinferno.com/general-notebook-discussions/1019-speculation-rumor-hm67-not-ivy-compatible.html
Code:
relating the topic from your source, the last post by zamfir makes more sense, this is what other user in this forum experienced while swaping cpus from ivy to sandy cpu.

the sandy cpu worked fine on the ivy laptop.

but fhe ivy cpu did not worked on the sandy laptop (black screen aka system not working)

my only guess is that shan383 mistaken his sandy bridge proccesor with some ivy proccesor.

else I would be really surprised it would work, specially without any firmware modding.

you can try if u want,hopefully I would be wrong...... however, sadly I dont expect any better results than zamfir had on his L702X laptop...

maybe you can go for i7-2860QM or even the extreme edition proccesors (XM) if you want more power.

however, that will cost a lot of money, and since you already have a quad core i7, the performance improvements may not be worth of money, so before spent that much money just on a proccesor, consider upgrade the laptop to a ivy or hasswell one.

about overclocking, as far I know you cant do much with that CPU

you can overclock only GPU into that laptop as far I know.


cpu overclocking is very limited into that laptop

only options are:

- tweak turbo settings in order to have more from it, you can use intel XTU
- get a extreme proccesor with unlocked multiplier (didnt tested it yet)
- BCLK overclock

I sucesfully unlocked BCLK overclocking on my L502X, however, that required both hardware and firmware modding, (desoldering , programming, and soldering chips and intel ME 7 firmware modding)
you have more info at the L502X bios mod topic from my signature.
I relased a firmware patch to enable BCLK overclocking at the L502x,however, dont have any for the L702X since I havent got that machine or firmware dumps from anyone with a L702X with a unlocked descriptor.

Thanks for all help you guys!!
post #9 of 20
Warning: Spoiler! (Click to show)
Quote:
Originally Posted by jacky452 View Post

Okay so I have received some replies from capitankasar, he seems really pro at this stuff:

Quote from capitankasar:
Code:
@jacky452

nope

ivy bridge cpus need intel ME version 8, L502X and L702X have version 7

we tried to update the ME firmeware to version 8 without success, also even we had success updating it, there would be no guarantees it would work due posible chipset or BIOS limitations.

I would be really surprised if that is right (running a ivy bridge cpu on a sandy bridge motherboard, specially the HM67 mobile chipset present into the L502X and L702X wich have officially no support for ivy)

http://forum.techinferno.com/general-notebook-discussions/1019-speculation-rumor-hm67-not-ivy-compatible.html
Code:
relating the topic from your source, the last post by zamfir makes more sense, this is what other user in this forum experienced while swaping cpus from ivy to sandy cpu.

the sandy cpu worked fine on the ivy laptop.

but fhe ivy cpu did not worked on the sandy laptop (black screen aka system not working)

my only guess is that shan383 mistaken his sandy bridge proccesor with some ivy proccesor.

else I would be really surprised it would work, specially without any firmware modding.

you can try if u want,hopefully I would be wrong...... however, sadly I dont expect any better results than zamfir had on his L702X laptop...

maybe you can go for i7-2860QM or even the extreme edition proccesors (XM) if you want more power.

however, that will cost a lot of money, and since you already have a quad core i7, the performance improvements may not be worth of money, so before spent that much money just on a proccesor, consider upgrade the laptop to a ivy or hasswell one.

about overclocking, as far I know you cant do much with that CPU

you can overclock only GPU into that laptop as far I know.


cpu overclocking is very limited into that laptop

only options are:

- tweak turbo settings in order to have more from it, you can use intel XTU
- get a extreme proccesor with unlocked multiplier (didnt tested it yet)
- BCLK overclock

I sucesfully unlocked BCLK overclocking on my L502X, however, that required both hardware and firmware modding, (desoldering , programming, and soldering chips and intel ME 7 firmware modding)
you have more info at the L502X bios mod topic from my signature.
I relased a firmware patch to enable BCLK overclocking at the L502x,however, dont have any for the L702X since I havent got that machine or firmware dumps from anyone with a L702X with a unlocked descriptor.



You could go for the 2860qm and see if that would work for you. would still be a 5-15% boost. still not quite worth the effort in my opinion though.
post #10 of 20
Quote:
Originally Posted by XanderTheGoober View Post

Warning: Spoiler! (Click to show)
You could go for the 2860qm and see if that would work for you. would still be a 5-15% boost. still not quite worth the effort in my opinion though.

There's a much larger gain going from the 2630QM to the 2860QM than just 15%.

It's a solid 30% at the minimum and it IS worth it. The added 2MB L3 cache is definitely something to be considered. Helps with Single threaded tasks.
     
CPUMotherboardGraphicsRAM
Intel Core i5-6300HQ Dell Proprietary 4GB Nvidia GTX 960M Samsung 12GB (1x8GB 1x4GB) DDR3L 1600 MHz 
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CPUMotherboardGraphicsRAM
Intel Core i5-6300HQ Dell Proprietary 4GB Nvidia GTX 960M Samsung 12GB (1x8GB 1x4GB) DDR3L 1600 MHz 
Hard DriveHard DriveCoolingOS
256GB SanDisk M.2 SSD 1TB HGST 7.2k HDD Custom Cooling by Dell Solutions Windows 10 Home 64-Bit 
MonitorKeyboardPowerMouse
15.6" 1920x1080 IPS Screen Dell 130w PSU Logitech G602 Wireless 
Mouse Pad
Xtrac 'Ripper' Mouse Pad 
CPUMotherboardGraphicsRAM
Intel Core i7-2760QM Toshiba Qosmio X775 Nvidia 1.5GB GTX 560M 8GB DDR3 1333 
Hard DriveOptical DriveCoolingOS
120GB Samsung 830 SSD + 1TB HGST 7200RPM HDD CD/DVD-RW Stock Windows 10 Home 64-Bit 
MonitorKeyboardPowerMouse
17.3" - 1600x900 Standard backlit 180w Power Adapter Logitech G500s 
Audio
Harmon/Kardon Onboard 
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