Solved New monitor, PC lags badly

[Jaakow22]

I recently got a new Samsung monitor and since then my PC lags as sh*t, it works worse than my 10 year old PC. First I thought its because of the graphics card but isn't 2 GB DDR3 enough for a full HD resolution?
Even internet browsing lags, scrolling is not smooth even on the lighter sites. In games I get about 25 FPS less and lag spikes in games. My PC specs are:
CPU: Intel Celeron Dual Core E3400 2.6 GHZ
Motherboard: ASUS P5G41T-M LX3
RAM: 4 GB (2x2)
GPU: Gigabyte AMD Radeon HD6670 2GB DDR3
I don't think the other components matter.

And I saw that my GPU is used up to 80% when not playing games, just browsing the web or searching something, I can't even watch a 720p video on Youtube, I have to set to 480p to watch it without lag.
Btw I use Firefox.

I had an ASUS monitor 1366x768 and now I have SAMSUNG 1920x1080.
I will reinstall windows soon but I don't think that would be a problem.
Any ideas? Is the resolution the problem?

Excuse my English.
Any feedback would be much appreciated.
​

 

[corruptDNA]

I recently got a new Samsung monitor and since then my PC lags as sh*t, it works worse than my 10 year old PC. First I thought its because of the graphics card but isn't 2 GB DDR3 enough for a full HD resolution?
Even internet browsing lags, scrolling is not smooth even on the lighter sites. In games I get about 25 FPS less and lag spikes in games. My PC specs are:
CPU: Intel Celeron Dual Core E3400 2.6 GHZ
Motherboard: ASUS P5G41T-M LX3
RAM: 4 GB (2x2)
GPU: Gigabyte AMD Radeon HD6670 2GB DDR3
I don't think the other components matter.

And I saw that my GPU is used up to 80% when not playing games, just browsing the web or searching something, I can't even watch a 720p video on Youtube, I have to set to 480p to watch it without lag.
Btw I use Firefox.

I had an ASUS monitor 1366x768 and now I have SAMSUNG 1920x1080.
I will reinstall windows soon but I don't think that would be a problem.
Any ideas? Is the resolution the problem?

Excuse my English.
Any feedback would be much appreciated.
​

1920 resolution is pretty heavy, im thinking cpu is the bottleneck, but id wait for someone to confirm this.

 

[Indianatone]

Hi, your CPU though a budget one should be able to play HD content with the video card just fine. I suspect as it is a few years old the cooler may need cleaning and or replacing the thermal paste on the heatsink. I suspect throttling due to overheating.
Download this and post a screen shot having maxed out your CPU so we can see how high the temps go.
CPUID - System & hardware benchmark, monitoring, reporting

 

[Mellon Head]

Hi, your CPU though a budget one should be able to play HD content with the video card just fine. I suspect as it is a few years old the cooler may need cleaning and or replacing the thermal paste on the heatsink. I suspect throttling due to overheating.
Download this and post a screen shot having maxed out your CPU so we can see how high the temps go.
CPUID - System & hardware benchmark, monitoring, reporting

Spot on advice. I wonder what would cause his video card to run at 80% while essentially idling?

 

[Jaakow22]

The CPU is not overheating, it is 78°C at full load with prime95, and I it is not throttling because it is at 2600 MHz and when idle 1200 MHz, I don't know how, but now everything works fine, it was lagging just 2 days after I replaced the old monitor and I don't know the cause of that.
And I have to clean the computer, I haven't cleaned it for over a year, and BTW does my GPU support multiple monitors? It has 1 DVI, 1 VGA and 1 HDMI, because currently I have 4 monitors at home and 4 computers, 2 computers are broken, I will sell the CRT monitor for 10$, and I have another unused monitor, so I can have 2 monitors on my PC, it would be nice, I know that having 2 same monitors looks better but however better 2 different ones than only 1 monitors.

 

[Indianatone]

Yes it does support multiple monitors, 2 at least and possibly 3. I DVI, 1 HDMI and possibly the VGA at the same time depending on the exact make and model of the card. You can buy HDMI to DVI leads / adaptors as they are the same standard.