Please help me to determine if my rig GPU/CPU bottleneck

wolfgang12 · Aug 15, 2014

Hello guys,
I have a problem with my rig, before I explain, here is my rigs:

CPU: Core 2 Quad Q8400
GPU: Asus HD 7790 Direct CU II
RAM: 4 GB
Motherboard: Asus P5KPL AM/SE
PSU: FSP Hexa+ 500W

I'm playing game such as NFS Rivals (locked 30 fps), Saints Row IV, AC IV and I'm having low fps around 15 and max fps no more than 30 and that is really, really uncomfortable. As you can see, my motherboard and CPU are really old, are those the reason I have bottleneck?

Jcomptech · Aug 15, 2014

Do you have money to upgrade? Also, your cpu is quad core as gaming is more prefered towards it. The RAM could be the culprit. I would say upgrade your RAM to 8GB. Bottleneck shouldnt be an issue. I do think that you should upgrade your cpu and motherboard.

Here are some suggestions:
i3 - 4360 - $159.99 http://www.newegg.com/Product/Product.aspx?Item=N82E16819116993&cm_re=i3-_-19-116-993-_-Product

MSI CSM- H87M - $74.99 http://www.newegg.com/Product/Product.aspx?Item=N82E16813130710&cm_re=msi_CSm-_-13-130-710-_-Product

HyperX Fury Series 8GB (2 x 4GB) - $89.99 http://www.newegg.com/Product/Product.aspx?Item=N82E16820104448

ALL prices are from Newegg.

MeteorsRaining · Aug 15, 2014

I don't see any bottlenecks there.

geofelt · Aug 15, 2014

A perennial question.
Here is my stock answer:

To help clarify your CPU/GPU options, run these two tests:

a) Run your games, but lower your resolution and eye candy.
If your FPS increases, it indicates that your cpu is strong enough to drive a better graphics configuration.
If your FPS stays the same, you are likely more cpu limited.

b) Limit your cpu, either by reducing the OC, or, in windows power management, limit the maximum cpu% to something like 70%.
Go to control panel/power options/change plan settings/change advanced power settings/processor power management/maximum processor state/
This will simulate what a lack of cpu power will do.
Conversely what a 30% improvement in core speed might do.

You could also experiment with removing one core in the bios. This will tell you how sensitive your games are to the benefits of many cores.

If your FPS drops significantly, it is an indicator that your cpu is the limiting factor, and a cpu upgrade is in order.

It is possible that both tests are positive, indicating that you have a well balanced system, and both cpu and gpu need to be upgraded to get better gaming FPS.

BloodyHoss · Aug 15, 2014

you might want to look into updating your cpu and motherboard, and maybe upgrading to 8gb of ram, that could be the reason you're not getting the best frame rates from that card (which isn't an insane card so don't get your hopes to high :/) With an up to date board, and cpu you should be seeing a difference in performance. Maybe looking into intels z77 chipset, paired with a higher end i3, and 8gb of ram, you should be good.

wolfgang12 · Aug 15, 2014

Jcomptech :

Thank you for the recommendation
I have money and planning on getting FX-6350, for the motherboard I'll find cheapest am3+ motherboard
For the RAM, not so long ago I upgraded from 3 to 4 and I don't see any difference, or should I upgrade further?

wolfgang12 · Aug 15, 2014

Ups wrong click, sorry for the best solution mistake

wolfgang12 · Aug 15, 2014

MeteorsRaining :

Sorry I got click mistake, I'm planning to reply you

I run the game on 1366x768 and I saw benchmark of this gpu on youtube that it works very well on 1080p, that's why I conclude that my PC bottleneck

wolfgang12 · Aug 15, 2014

BloodyHoss :

I'll consider it

yeah this is not an insane card but I still confused why the frame rate of this card in youtube gameplay video always above 30

wolfgang12 · Aug 15, 2014

geofelt :

A perennial question.
Here is my stock answer:

To help clarify your CPU/GPU options, run these two tests:

a) Run your games, but lower your resolution and eye candy.
If your FPS increases, it indicates that your cpu is strong enough to drive a better graphics configuration.
If your FPS stays the same, you are likely more cpu limited.

b) Limit your cpu, either by reducing the OC, or, in windows power management, limit the maximum cpu% to something like 70%.
Go to control panel/power options/change plan settings/change advanced power settings/processor power management/maximum processor state/
This will simulate what a lack of cpu power will do.
Conversely what a 30% improvement in core speed might do.

You could also experiment with removing one core in the bios. This will tell you how sensitive your games are to the benefits of many cores.

If your FPS drops significantly, it is an indicator that your cpu is the limiting factor, and a cpu upgrade is in order.

It is possible that both tests are positive, indicating that you have a well balanced system, and both cpu and gpu need to be upgraded to get better gaming FPS.

Thanks, I'll try option (a)

Jcomptech · Aug 15, 2014

wolfgang12 :

Jcomptech :

Thank you for the recommendation
I have money and planning on getting FX-6350, for the motherboard I'll find cheapest am3+ motherboard
For the RAM, not so long ago I upgraded from 3 to 4 and I don't see any difference, or should I upgrade further?

What is your RAM latency, frequency and/or memory capacity?

MeteorsRaining · Aug 15, 2014

I think maybe your PSU is a bottleneck, try upgrading it to a better one, preferably a Tier 1 or Tier 2.

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Please help me to determine if my rig GPU/CPU bottleneck

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