M17x R2 CPU upgrade i7 840QM or 920XM

I know i know, the 920xm......but is that a fact?

I read the specs on both CPU's and one does not really outrun the other (Stock).
Lets see if i can make a list of up and downsides.

920XM:
upside:
Overclockable

Downside:
Expansive
no fan support with GTX 680m
Heat

840QM
Upside:
Cheap
Quad core running 3,2Ghz (same as 920) (boosted)
lower TDP means less power/heat.

Downside:
Does not overlclock.

Anybody here ever had a 840QM and has some REAL WORLD figures with a 680m?



The 620m is just for good measure (current CPU)

 

I'd go with a 920xm because it is overclockable and thus you can get better performance and extend the life of your machine.

 

Depends on your budget, 920XM is stupid expensive right now, like 400+. Used ones used to go like high 200's. I haven't had a real bad heat issue with my 920XM...the heatsink in the R2 cools it just fine (mine has an OEM one).

 

Like i said , i already know that the perfomer is the 920xm but thats only when overclocking and i just want to see specs between the 2 cpu's in a real world (non synthetic) benchmark of a top high end videocard.

I dont want to spend more money then i need to.
I can take the GPU with me when i go M18x R2...the CPU will get left behind with the barebone.

So yes people, i already know that the 920xm.....blabla...i want benchmarks

 

depends on if your playing CPU intensive games or whatever. That is where the 920xm will outshine the 840.

 

I agree 920xm is the best bet. But prices on eBay are extremely high. Multipliers can be adjusted easily with xm through throttlestop. A lot harder with qm CPU.


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Benchmarks please......judging from the ark of Intel they would be the same in architecture and they both boost to 3,2Ghz and are both Quad Core.
Yes 920 is the better CPU but i want to SEE it. i want to know why i should pay $400,00 difference for a quad core that pushes 3,2Ghz (Stock level)

I cant find a forum ANYWHERE where these 2 are put together in a real world benchmark....i wonder why....

 

go through the benchmark thread and see if you can find something, An overclocked 920xm beats my poor 2630qm in 3dmark vantage I know that at least. Just not sure how an 840qm does. you are right there isn't to many comparisons, but you can see the same lack also with the sandy bridge and ivy bridge CPU differences as well.

 

Well, it not like it's black and white comparison but, just remove the first digit from the next i7 core generation and you see what cpu class you have.
basicly the architecture is faster and more effecient but its still a simpler cpu...its the 630
The 920XM is older i admit but the permormance per core/ per frequency is in benefit of the 920XM...why....because it gets a higher clock..nothing more, nothing less.....strange how the 840QM never was benchmarked against the 920XM...they are around the same release date and since the 920xm retailed at around a $950,00 and the 840QM was around $500,00 it would have been the logical thing to bench.......meh...i geuss i'll just buy the damned 840QM and bench it myself hahaha....lets make history

 

AHA, i think i found something....

I am not sure if the 920XM has the same logical in the turbo boost but:......

The Intel Core i7 840QM is a high end quad core CPU in 2010. It features 4 cores (quad core CPU) and Hyperthreading. Therefore, 8 threads can be worked on simultaneously.

Because of the Turbo Mode, the CPU is clocked with up to 3.2 GHz (if only one core is used, 2.93 for two cores, and 2 ghz with 4 cores) and therefore can perform very well in single core applications like older games.

Is this the real difference?? can anybody confirm this?

 

All Intel CPUs with turbo boost function like that, including XM ones. The main difference with an XM is the ability to control the clock speed of each individual core at your discretion. For example, you could have the 920XM running at 3.2 GHz across each of the 4 cores. I'm not saying that is possible as I've never owned one myself, but OC potential differs between every XM CPU. You might find a bit more info regarding those 2 CPUs in this thread:

http://forum.notebookreview.com/sager-clevo/493765-new-intel-core-i7-740qm-840qm-940xm-vs-720qm-820qm-920xm-benchmark.html

 

It is entirely possible

My daily config is 24x133 across the 4 cores with 75W tdp. My original CPU was an 840QM, wich is resting on my draw. The difference between the 2 is huge. Go for the 920xm.

 

Well sell that to me for the time being
Send me a PM

when budget allows it, i will consider the 920mx....although for that money i can almost buy the m18x barbone.....

 

Thanks man!
This is the stuff i was looking for and it just confirms what i already thought.
When looking at this comparison (where the 940 is used but the 920 is also in the list thank god , in real world application there is no difference so there is nog real reason for me to spend €$400,00 more on same architectural cpu that can get a higher boost. (personal opinion)

+1 REP for tetsussaiga

 

Well i chose the 920(OEM) after all.
Despite the higher temps. It really is a awesome cpu, i am so glad i sis not take the 840 because i love to OC and get some more out what is already a fast OC


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