How does CPU bottlenecking GPU decrease gaming performance?

Newbie-asker · Oct 17, 2015

Hello
How does CPU bottlenecking GPU decrease gaming performance?
i need it in percent like: decrease performance of GPU by 16%
or any well explained simple details on how does it reduce gaming performance!.

Tradesman1 · Oct 17, 2015

It depends on your rig and how big the bottleneck is, could be just a little, or could be a lot, there's no way to give a percentage that would be accurate

rgd1101 · Oct 17, 2015

It mean the gpu is waiting for the cpu to complete it task.

Unolocogringo · Oct 17, 2015

There is not a single answer.
The CPU must feed the video car with all of the scenes geometry, before the video card can render and display it.
So if you matched an older Core 2 Duo @2.4ghz with a 750TI, in some games there would be no bottleneck and others up to 40%.
If you placed a GTX 970 in the same machine you would get 10% bottleneck in a few games and up to 60% bottleneck in most newer games.

Some games are very CPU dependent and others are very GPU dependent , while others are both GPU and CPU dependent. So there is not a simple single answer to your stated question. It varies greatly by game and CPU/GPU combo.

Unolocogringo · Oct 17, 2015

Also screen size(pixels not inches) plays a very important part of the equation.
The larger the resolution the more stress placed on the video card.
The lower the resolution shifts the bottleneck more to the CPU.

Newbie-asker · Oct 17, 2015

Okay for example i want to upgrade my old PC it has CPU Pentium E2220 and i want to replace its GPU with Geforce GT 610 will it bottleneck?

maxalge · Oct 17, 2015

Newbie-asker :

if the cpu is not fast enough to keep up with the gpu, the gpu will sit idle waiting for the cpu to catch up

the cpu then becomes the bottleneck, the main limiter of fps

depending on game, gpu performance loss can be ~10 - 50% or more

unksol · Oct 17, 2015

No but a 610 is pretty much worthless for anything but media and desktop work.

USAFRet · Oct 17, 2015

Bottleneck - either a good GPU is waiting on the CPU to do something, or a good CPU is waiting on the GPU to do something. So the 'good part' can't run to its full extent. It is waiting on the weak sister.

There is no specific number or percentage.

And for a given selection of parts, that may go either way for different games. Some games or applications rely more on the GPU, some more on the CPU.

Newbie-asker · Oct 17, 2015

I know GT 610 is bad but it will run simple games like L4D2 then no prob
i don't want to spend a lot on old PC
So will Pentium E2220 bottleneck it or no?

Unolocogringo · Oct 17, 2015

GeForce GT 730 64-bit GDDR5 is you best bet for a cheap entry level video card.
Make sure it is the 64bit version, not the 128bit version.
The GT610 is not a gaming card and will be mostly a waste of money.
minimum system requirements
CPU: Pentium 4 3.0 GHz
CPU Speed: 3.0 GHz
RAM: 1 GB for XP or 2GB for Vista/7
OS: Windows® 7 / Vista / Vista64 / XP
Video Card: DirectX 9 compatible video card with 128 MB, Shader model 2.0. ATI Radeon X800, NVIDIA GeForce 6600 or better
Sound Card: Yes
Free Disk Space: At least 7.5 GB of free space
Recommended requirements for smooth game play.
CPU: Intel Core 2 Duo 2.4 GHz
CPU Speed: Intel Core 2 Duo 2.4 GHz
RAM: 1 GB for XP or 2GB for Vista/7
OS: Windows® 7 / Vista / Vista64 / XP
Video Card: DirectX 9 compatible video card with Shader model 3.0. NVIDIA GeForce 7600, ATI Radeon X1600 or better
Sound Card: Yes
Free Disk Space: At least 7.5 GB of free space

Newbie-asker · Oct 17, 2015

Unolocogringo :

If its that bad GPU then this video is fake? : https://www.youtube.com/watch?v=vVDg05gj7-w
Please tell me i'm not sure its real or fake
also this two :
https://www.youtube.com/watch?v=qL5U2nBtMUw
https://www.youtube.com/watch?v=hX5ijBupaio

Newbie-asker · Oct 17, 2015

Cool i never heard about this great GPU for old PC's (GT 730) its compatible with my PC!

pete_101 · Oct 17, 2015

Newbie-asker :

Not fake, just low settings, low resolution and not very good frame rates.
As I said to you yesterday when you asked about the GT 740, it would most likely be fine, but be aware that your unbranded 400W PSU could potentially fail. However the GT 730 requires less power and would be a good match (as would the 610), but for gaming you want the best GPU you can run.

pete_101 · Oct 17, 2015

Newbie-asker :

You have gen 1.0 PCIe. All cards are backward compatible and a low end card like the 730 should work just fine.

Newbie-asker · Oct 17, 2015

pete_101 :

The GTA V video is 1280X720 and medium settings

Newbie-asker · Oct 17, 2015

My prob is i never purchased from Amazon but i purchased before on another online store and the store i tried delivered items in around 3 days and now the GT 610 is available their i'm scared if i purchased from Amazon and lost my money and didn't got the GT 730 and the store i tried and trust has the option for Cash on Delivery

pete_101 · Oct 17, 2015

If you live in the States, use Newegg, they are cheaper than Amazon http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&DEPA=0&Order=BESTMATCH&Description=gt+730&N=-1&isNodeId=1

USAFRet · Oct 17, 2015

Newbie-asker :

I've purchased hundreds of items, worth thousands of dollars, over a 10 year span, from Amazon.
Similarly, on a smaller scale, from Newegg.

The number of times an item has been ordered, paid for, and not been delivered is exactly zero.

Newbie-asker · Oct 17, 2015

USAFRet :

Newbie-asker :

I've purchased hundreds of items, worth thousands of dollars, over a 10 year span, from Amazon.
Similarly, on a smaller scale, from Newegg.

The number of times an item has been ordered, paid for, and not been delivered is exactly zero.

I don't own Credit Card
will be it safe to purchase through gift card?

USAFRet · Oct 17, 2015

Newbie-asker :

USAFRet :

I don't own Credit Card
will be it safe to purchase through gift card?

Probably.

How does CPU bottlenecking GPU decrease gaming performance?

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