Hey guys i was wondering just what factors affect fps (core clock etc etc)
Im not actualy sure what affects fps and im a little baffled as something like the 560 i saw had a higher clock speed than the 580 but yet it was gaining lower fps so just what makes the fps higher and what should i look for when buying a new gpu -stormz
Hello silverstormz,
There are a
few factors that affect FPS:-
1) GPU architecture
The
general rule of thumb when it comes to determining the effect of a particular graphics card's attribute to its performance is as follows, from
most influential to
least influential:-
The amount of Shaders/CUDA cores (as compared to the same family/generation of cards),
followed by the card's ROPs,
Shader/Processor/CUDA core clocks,
Memory Type (Dedicated, or Integrated) and Interface (64, 128, 256 and 384 bit) ,
Memory Speeds (clocks) and Generation (DDR3, GDDR3, GDDR5) and
finally, the Amount of Memory (512 MB - 3 GB).
When you compare the GTX 560 and GTX 580, you have to note that the 580 has a higher number of CUDA cores
(512 cores) as compared to the GTX 560 Ti
(384 cores) and the 560
(336 cores).
http://www.geforce.com/hardware/desktop-gpus/geforce-gtx-580/specifications
http://www.geforce.com/hardware/desktop-gpus/geforce-gtx-560ti/specifications
http://www.geforce.com/hardware/desktop-gpus/geforce-gtx-560/specifications
This indicates that the even if the GTX 580 is
lower clocked than the GTX 560 variants,
(recalling the hierarchy listing, number of Cores>Core clocks), the 580 will still perform better, resulting in a higher FPS count for the GTX 580.
To summarize, as Britton30 put it above, get a Graphics card with many cuda cores/shaders, one with at least a 256 bit memory interface and one with 2 - 3 GB of GDDR5 RAM
Another way of
quickly determining the prowess of a card based on its model number is to look at the second digit of the number, given that the the cards in the comparison are of the same generation.
Example:- GTX 5
80 vs GTX 5
60, 8 is higher than 6 so 580 is more powerful
2) CPU Clocks and Architecture
Although most games and 3D applications are
GPU limited (which means that they can only run
as fast as your graphics card can perform, and the CPU doesn't really affect the speed), there a few that require the CPU heavily for additional functions, like multi threaded physics simulation calculations, and threaded AI.
Notable examples in which your CPU might heavily affect your FPS is in
strategy based, AI heavy games like Civilization V, and Battlefield 3 with it's dynamic multi-threaded renderer
In this case, the
superior CPU would be one with at least quad cores and lots of
Level 1/2/3 cache plus an
IMC (
Integrated Memory Contoller, reduces RAM access latency. All Intel CPUs since the Core i series and AMD CPUs since the Athlon 64 have this built in.).
Hyperthreading is also a bonus to have but it's effect
varies from game to game. (the Core i7/i5 series by Intel and the Bulldozer series by AMD)
3) Your RAM amount and speed
Your game requires system RAM to run optimally.
Insufficient system RAM could lead to parts of the game being
sent out to the pagefile on your HDD which would lead
catastrophic loss of performance and FPS, and/or
stuttery performance. (the game is trying to load assets from the HDD instead of the
system RAM which is a few orders
of magnitude faster than your spinner)
RAM Speeds are also important but the
margins of improvement in your FPS are not as noticeable when using
slower RAM but sufficient RAM as compared to if you have
insufficient RAM
Get at least
8 GBs for a 64 bit OS, 16 GB (or as much as your motherboard supports) to be future proof.
4) Your HDD type (SSD vs HDD)
Games that rely on
streaming in assets continuously to the
system RAM/VRAM (Video RAM) will perform better on a
SSD as compared to a conventional HDD.
Examples include games that use the Unreal Engine 3 middleware such as Gears of War PC, and Mass Effect 3
5) Background Applications and other Antivirus Scanners (AVs) and Scanners
Having a
high number of background programs and parasitic applications will of course lower your FPS due to
resource contention.
If you want the absolute fastest FPS count during gaming, shut down all
unnecessary tasks and programs before starting the game to ensure that the PC will dedicate all its resources to the game.
Set
AVs into
gaming mode if available and disable active
real time malware scanning while gaming.
This (disabling protections for AVs) of course doesn't apply to online gaming.
6) Drivers
Having old and outdated drivers will reduce your FPS.
The latest drivers for your card are usually the best, unless there are specific issues pertaining to the card/game for that particular driver
7) Other things to look out for when looking for a graphics card.
Power requirements (Do I have a
PSU strong enough to handle this
graphics card? How many 6 pin PCI-E connectors will i need to power this card and do i have them?)
Dimensions (How many slots will it occupy in the case?, Will it fit my case?)
Manufacturer warranties (Terms? 1 year? 3 years? The longer the better. What are the
RMA policies in case of breakdowns?),
Cooling systems (how many fans does it have, is it
noisy or quiet, fan RPMs, low profile) and
Overclocking status (
Is it factory overclocked? How far can it be pushed?)
Always check out reviews from reputable sites like
HardOCP for a preliminary look at how the card you're interested in will perform for you and the reviewer's experience with the card.
[H]ard|OCP - HardOCP Computer Hardware Reviews and News
There're quite a few more but i think this should get you started.
Hope that answers your queries! If you have further
enquiries, don't hesitate to post them in this thread.
