You have twelve gigs of RAM. You could do a search on the internet using your computer module to find out if you use fourth gen ram. Also your motherboard manual might help. You might read any specs on the computer. Haven't tried you might try bios to check.

I've highlighted your System memory and Display memory (Graphics Card) on your post.

Most games will list minimum graphics cards that will work. Yours is - Card name: NVIDIA GeForce GTX 670 

silly me, I was inprecise.  I meant >what type of ram<  is installed, what type of ram cards, or whateve they are. 

answer =

12.0GB Triple-Channel DDR3 @ 534MHz (8-8-8-20)

Umm...which ignore should we ignore, Elana?

Your motherboard is triple channel.  It has six slots and supports 24GB.  There isn't any 534Mhz ram though, DDR is x2, you're running 1066, you should be able to run up to 1866 on that board, which would be much faster.  This only has a minor impact on the performance you'll get though.  Things are limited by storage typically, or processing, so you'd gain responsiveness from an upgrade, but nowhere near the difference in the speed of the ram.

Dual, triple and quad channel are chipset specific.  More is better, but it's entirely dependent on your system which you use.

DDR is double data rate.  It's like an engine firing twice per revolution, versus once.  It processes on the rising and falling edges of the signal.  Speccy doesn't correct for this for some reason, and shows it the same as it would if it were SDRam from the late 90's.

if you want to know what hardware is build into the system next time, i can recommend AIDA64
you wont need to open the rig up, since it will list every component inside with detailed information, such as manufacturer. 

https://www.aida64.com/downloads
AIDA64 Extreme ... trial 
But should suffice to identify the manufacturer of the Motherboard and the RAM.

Looking at the systeminfo, I would say that the issue you encountered before is either related to the Graphics card driver, if that date stamp is still valid due to the log of 2015.
Or the Graphics card itself since it isnt fast. (in other words outdated, since it had it's launch in Mai 2012)

Check your drivers and see if there are any updates available over at www.nvidia.com
go to drivers and choose:
product type geforce
Product Series : 600 Series
Product GTX670
OS: WIn7 64bit

download
launch the driver update 
Install with advanced settings
and choose clean install and select everything in the box
restart the system afterwards.


 

6 vs 4 cores 
single core speed is higher on the i5 
while on multi core processes the i5 gets destroyed by the i7  

http://www.cpu-world.com/Compare/450/Intel_Core_i5_i5-2500K_vs_Intel_Core_i7_i7-960.html

none of the whql drivers are rushed out, most of them are dedicated to recent game releases therefore its always wise to have the old one as backup if you plan to overwrite the otherone. The drivers not rated whql are the beta ones that are rushed out as hotfixes.

As far as what the GTX670FTW concerns 
Lets say you intent to buy a newer model like the gtx 970 the vanilla version with stock cooling unit.
The difference here is that the 970 has a higher core speed and also has the benefit of boost clock
The card would be about 35% faster than your current one.
it also can run DSR -. Dynamic super resolutions. technically 4k with bad FPS
BUT I DONT RECOMMEND TO BUY THIS CARD
I run one myself currently and plan to ditch it since 4GB are not covering recent game demands for Ultra Settings.

About the RAM nothing has drastically changed when it comes to DDR4 however you can now have bigger modules with the same latencys 
Same goes for ddr2 vs ddr3 what changed is the Mhz they keep improving on each new version.
So each version technically has the ability to transfer data for I/O at faster speeds of its memory cells and through that enabling faster bus speeds.
The thing is that if you pick faster memory than your cpu and board can handle you need to start clocking to get the performance out of it, otherwise the Mhz will be lowered so that the CPU can handle them.

After reading your info once again im a little concerned about your temps.
YOu write that the processor runs at 75 degrees celcius - is that idle or under load?
What kind of cpu coller do you use?

I ask this since if those temps are messured while idle its no wonder that it will perform horrible when gaming.

All i was saying that the best investment to push the time to buy a newer system further out would be a gfx card, but after reading those temperatures i need to make sure that the cpu isnt overheating first.
Since that could be the issue.

Running the witcher on high settings :

Recommended requirements:

DDR is Double Data Rate, DDR3 is third generation DDR.  Not a math function, just a version number.  Speccy is completely accurate, it's just not "smart" for "dumb" people, which is actually kind of nice since so much of that stuff causes people grief...

They're actually lying when they call the stuff 1066Mhz ram, it's accurately 533Mhz double pump ram, a matter of salesmanship versus ignorance of the masses, many of whom are incapable of even finding such information, let alone knowing what it means.  For us nerds who live for this stuff, it's just a quirk of the software that we take note of.

The confusion could be between clock, and bus speed. In this case clock speed is more important. If the ram is ddr3s that is important. The only speed you need to know when buying is clock, not bus speed. Clocks haven't ran at 533 in a long time. I doubt ddr3s ever ran at that. My guess 533 is the bus. If that's true then the clock is a lot faster. You need to know the clock, and be sure they are ddr3s. This is really important. Never had a solid state drive before it makes a huge difference. Do you have a laptop. Some i7 laptops are duel core. Check power settings. By default all computers are set to balanced, change this to high performance.

 As far as cooling they recommend radiator. Unless this is not your specialty then they recommend fans.

i didn't recommend anything i just quoted the min sys req of that game from their site (quick google. i don't have that game, didn't read details). which seems to suggest the gfx card is above the min sys req

what does the min mean? maybe not high settings. which is why i asked if you tried lowering settings (say.. to low or medium or something)

as for cpu comparison. i don't really know anything about it. i did a quick google and saw the benchmark graphs in below site before i mentioned it might be not quite up to the min req. no idea if it's accurate or not.

http://cpuboss.com/cpus/Intel-Core-i7-960-vs-Intel-Core-i5-2500K

note they are both quad core.. though the 960 has 8 threads rather than 4. i have no idea what the data in that other site mentioned really means as there's no benchmark. just a bunch of feature comparison.

as for drivers. new ones come out all the time.. but i personally haven't gone beyond 362.00 yet (i have a 970) due to supposed issues for certain people in the last few months.

https://www.reddit.com/r/nvidia/comments/50b4gp/driver_37270_faqdiscussion_thread/

the 970 has issues with its ram being 3.5+0.5 rather than 4. how much does that matter? no idea. the 10X0 series obviously better though more expensive (even 1060)