Upgrade from Sandy Bridge CPU or go SLI?

ChurchillsDog

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Jul 14, 2015
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Hello and thank you for reading this thread!

I find myself having a little bit of spare cash which I wish to spend on upgrading my PC (which is near 5 years old, graphics card excepted) but having researched it heavily over the last week or so I am unable to decide what to do. Therefore, I thought why not ask the good people of the Tom's Hardware forum?

To start with, here is my system as it stands:

Intel Core i5 2500 @ 3.3GHz (unfortunately not the K version so no overclocking)
MSI GTX 970 Gaming 4G
Gigabyte GA-Z68-XP-UD3 Motherboard
8GB DDR3-1333 (made by a company called Mustang but I have no idea who they are or what the part is exactly)
Samsung 850 EVO 250GB SSD
1TB Western Digital Hard Drive
Corsair CX650 PSU
Corsair 300R Case
AOC G2460PG 24" 1080p 144Hz G-Sync Monitor

The system is used for gaming (no video editing or heavy professional workloads) and I play a wide variety of games (The Witcher 3, GTA V, Europa Universalis IV, Total War series, FIFA etc.) I recently upgraded to the GTX 970 from an old Radeon HD 6950 and the difference is fantastic but now I would like to go to the next level.

The problem is how best to do so? I read that open world titles (Witcher, GTA, Assassin's Creed and so on) are becoming more and more CPU taxing and my old Sandy Bridge CPU is technically under the official system requirements (although obviously they do play). However, it also seems that upgrading to even Devil's Canyon might not show a large performance gain over my 2500. On this point I am quite unsure as most forum threads have people asking whether they should upgrade from their overclocked 2500Ks- a solution I cannot do.)

My FPS in such open world games is... okay I guess. Even with quite a few settings turned down a bit I waver between 40-60fps and suffer things like pop-in and slow texture loading (The Witcher is installed on my SSD and GTA V on my HDD in case this makes a difference.)

I am wondering if this is my CPU unable to keep up? For instance I might have near 60fps but then a couple of textures and models will pop in a split second later without the frame rate dropping. Having used HWMonitor for the last week my CPU is reaching 100% load (No thermal throttling, thankfully) and my GPU Core load reaches 98-99%.

So I ask you, what is likely to be the best way to improve my performance?

1. Wait for Skylake and the i5-6600k (with new motherboard and RAM) in the expectation that 4 full processor generations will make a decisive difference in CPU- taxing open world games?

2. Add another GTX 970 and go SLI? This option would mean having to buy a new PSU as well.

3. Upgrade to a Devil's Canyon (i5- 4690K) and do a little overclocking?

Naturally, options 1 and 2 would be great but money does not permit so it has to be one of the options (or another if someone else has another idea)

My only concern about going down the SLI road is the 3.5GB VRAM issue. Whilst not really a problem today, I am thinking about 2-3 years down the road- will even 1080p require more than this, after all, you can reach this limit on Shadow of Mordor if you max everything out. It is also unclear whether DX12 games will support memory scaling in SLI or not (obviously older games will not). So I'd hate to have 2 970s sitting there reaching 100fps on some settings but not be able to turn up textures or what not because I'll run out of VRAM.

Anyway, thank you for reading this and considering my problem.

-ChurchillsDog
 
Solution
If CPU is at 100%, yes you should get a new one, but wait for Skylake to come out. It should come early August or late July according to what I heard people saying (I know, sources).

ChurchillsDog

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Jul 14, 2015
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Thanks for replying turkey, will preformance gains be appreciable with my GPU already reaching 98-99% core load? (is core load even the right metric to be using? I'm quite new to this.) I understand that the processors aren't out yet so it's impossible to say definitively.
 


The graphics card is generally supposed to run at 100% - it should be trying to output as many frames as possible in a given period of time. If you turn on VSync and cap the frame rate to 60FPS, usage could be lower if you are getting a stable 60FPS. CPU on the other hand is bad to have at 100% because it has a given number of tasks to complete in a certain period of time, but the GPU is free to render as many times it wants.
 
With Witcher 3, cpu optimisation is pretty good. You won't see any benefit from upgrading the cpu for this game if you looking at performance. What you may see is a smaller range with the minimum fps and your average fps.
Witcher 3 is one of the few games that will push your hardware. Check your ram usage with the game.
 
You'd have to upgrade your CPU to a say i5-4690K and OC it, at stock it will be an improvement but not really noticeable until OC comes in.

The SLI path will make a bigger impact despite the bottleneck your CPU will cause, however for that route I highly suggest you to invest on a better PSU, Corsair's CX series are built with low quality components and SLI will accelerate their degradation putting in risk your entire system. Which PSU to buy will depend entirely on your final budget, just aim to a Tier 1 or Tier 2 700w+ PSU in Tom's PSU tier list:

http://www.tomshardware.com/forum/id-2547993/psu-tier-list.html