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View Full Version : Ugrading from a i5 -> i7



JanThomas
12-22-2011, 11:38 AM
Hi,

I have an G74SX with a i5 2410m processor, and have some questions regarding it.
Is it possible to upgrade this one to a i7-2630qm?
Do I need to change any other things?
Will it be able to support 16gb of ram just by changing the processor?

fostert
12-22-2011, 02:49 PM
Upgrading the processor would indeed buy you speed in the G74. ...but according to http://ark.intel.com/products/52224/Intel-Core-i5-2410M-Processor-%283M-Cache-2_30-GHz%29
the 2410 should already support all the way up to 32GB (it says 16 GB Maximum Memory Size). I am beginning to learn that the Max memory size specs quoted there are per channel. The 2410 has a dual channel memory controller, therefore 32GB. The same spec must apply to the 2630QM, since I recently got 32GB running on my G74 (See http://rog.asus.com/forum/showthread.php?6851-G74-and-8GB-Memory-DIMMs...)

Threshold
01-08-2012, 12:29 AM
Upgrading the processor would indeed buy you speed in the G74. ...but according to http://ark.intel.com/products/52224/Intel-Core-i5-2410M-Processor-%283M-Cache-2_30-GHz%29
the 2410 should already support all the way up to 32GB (it says 16 GB Maximum Memory Size). I am beginning to learn that the Max memory size specs quoted there are per channel. The 2410 has a dual channel memory controller, therefore 32GB. The same spec must apply to the 2630QM, since I recently got 32GB running on my G74 (See http://rog.asus.com/forum/showthread.php?6851-G74-and-8GB-Memory-DIMMs...)

I'm sorry, but I feel the need to correct you-which I feel bad about, since I'm using your thread as a confirmation source in another forum for much the same issue, and I ran across this thread in searching for the one you've linked. Dual channel doesn't mean the listed limit is per channel; see below.

While it is true that said CPU will (or rather, should) handle 16GB, it won't handle 32GB, for the very simple reason that there aren't yet 16GB modules.

I don't have one of these laptops myself, but I've been in the market for one like them lately, and have been doing a fair bit of research. I ran across a disclaimer somewhere on Lenovo's site (which I can't seem to find at the moment) stating that the mobile i7 dual-cores can only access 2 DIMM slots, and also citing that as their reasoning for disabling (on the hardware level) two of the four physical slots in some of the W520 (http://www.thinkwiki.org/wiki/Category:W520) and W510 (http://forums.lenovo.com/t5/W-Series-ThinkPad-Laptops/W510-Lenovo-has-only-made-2-of-4-dimm-slots-available-what-to-do/td-p/308084) models. They go on to say that a quad-core can access all 4 DIMM slots, which suggests that it's not a capacity addressing limitation but rather a DIMM bank addressing limitation.

This jives with the fact that in the months since 8GB modules have become more widely known in the wild, the mobile i5 ARK pages have been updated to reflect that they're capable of supporting 16GB. There are still two mobile i7's, one of which is yours, which have not had their pages updated to reflect this, but we can assume that is simply an oversight, per your results.

To summarize: Mobile i5 (dual-core) will address 2 slots. Mobile i7 (dual-core) will also address 2 slots. Mobile i7 (quad-core) will address 4 slots. All at whatever capacities are available (BIOS update may be necessary, particularly if/when 16GB modules come out). Finally, provided the slots are both physically present and electrically conductive, the relevant issues are the CPU and OS. What motherboard is in it or who made it shouldn't matter.

With regards to the original post...
You can run 16GB with a dual-core mobile i5, if you get 2x8GB DIMMs. 4x4GB is cheaper, but not by enough to cover the cost of a quad-core mobile i7, although it would also give you a perfomance increase. I'm inclined to suggest that the CPU will benefit you more than the RAM upgrade, but if your usage is like fostert's (see the thread linked in fostert's post), then the opposite is true.

fostert
01-08-2012, 02:13 PM
Ah yes, thank you for this. I have read that the dual cores in the core ix series are usually paired with only 2 sockets. I simply forgot about this! I would think though their IMC architectures are similar and that when 16gb SODIMMs become widely available (there are plenty of 16GB modules already on the market, but only for desktops and workstations) a pair would work with the dual core cpus to give 32GB.