Sudden game performance drop

August 31, 2012 at 10:07:15
Specs: Windows 7, I3 2120/4gb corsair
Hi everybody.

I have a problem.

I started to notice that my OS was getting cluttered so i reinstalled it, but before reinstalling i made a bios update trough @bios from gigabyte.
i noticed the bios made the system to boot up slower.

After I installed the new fresh windows 7 ultimate 64 bit (I reformat-ed my whole HDD because that's what i usually do when install a new windows) I noticed that assassin's creed was lagging on some parts of the map where will run just fine before.I was like is going on ? is a 2007 game what will I need for crysis 2 i installed crysis 2 ( that I played before on the same pc) and I noticed a 3-5 fps drop in crysis and will lag when using sniper).

I tough the bios update F*** up my pc so I noticed gigabyte released a new bios (F7) i updated to it and the system will boot up faster just like before...but still the same problem in games.

I made a backup for my original bios (F4) and I flashed it back with @bios but still the same problem ...

I updated drivers I even got back to some old ones thinking the new ones are change at all.

The pc is 2 months old so there is nothing like old parts that could of failed...

It is my first custom made pc....( made by me :D) and no, the building part was correct cause it worked good almost 2 months
no dust, temperatures are good:

cpu: 35-standby 58-62-under load
gpu: 35-38-standby 65-74-under load (depending on game)

Psu is good enough I even disconnected the 2 fans that I have on the system 1 blue led and one normal to see if the psu is the change.
I defrag. my change.

I reinstalled the OS again so no change.

I removed ram reinstalled them, i removed video card ,cleared c-mos,load bios to default...nothing changed.

I'm running with the same software that I was before the bad thing happened.

I don't know what to do now...

So if somebody knows what is causing this, please help me...It was really hard for me to earn money to buy this pc and now it doesn't work properly.

System Specs

MB: Gigabyte B75-D3V

CPU: Intel I3 2120 3.3 Ghz

GPU: Asus AMD HD 6770 1GB GDDR5, 128 bit , 850 core clock (on the website said 4000 MhZ memory clock) 1000 Mhz Memory clock.

RAM: 4gb dual channel Corsair ( don't know the model ) 1666Mhz (running at 1333 Mhz)

HDD: WD Caviar Blue 250 GB Sata 3 7200 Rpm.

PSU: Energon 550 W

I'm running games all the time at 1920x1080 no matter if I have to turn the graphic settings to lower ( like I do with crysis 2...playing at that res. at "gamer" settings).

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August 31, 2012 at 13:12:15
Did you enter the BIOS screens after the update and reset the values that needed it?

The default might be to run SATA hard drives in an IDE compatibility mode, which will make the drive slower. Also, running in AHCI mode allows some drives to use advanced features that can further speed up performance.

All that said, sometimes BIOS updates are released to increase stability at the expense of performance. For maximum performance you should tweak memory settings and check to verify the CPU is running at specified settings. Also, throttling of the processor may be enabled (see link below).

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August 31, 2012 at 13:44:41
I tried to change from IDE to AHCI but it won't boot into windows and a message shows up saying "your computer needs to be restarted" something like this cause is fast and I can't read it.

other than that...The bios setting are the same as they were when i first powered up the It doesn't seem to be a problem for that...And as I said I flashed back the original bios ( ver. F4) that i had before.

I noticed something interesting....I changed the resolution in assassin's creed to the lowest (640x480 60 hz) and the lag didn't stop...In order to stop it from lagging i need to turn all the settings to very low...

I don't understand since for every game the resolution makes a big difference in performance...

yes CPU throttling is enabled, but it was before...

Other games like CoD Mw2 and Mw3 seem to work just fine....I don't really remember if the fps are the same with what they used to be but I guess they are

like in COD MW2 I get from 80 to 200 fps and it kinda used to be like that....I don't think is a hardware issue or a bios... although I've heard that is not really good to flash the bios though windows (in my case, with @bios from gigabyte)

Thanks for the answer, I'm glad someone cared about my problem...

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August 31, 2012 at 14:03:45
You need to change those settings BEFORE installing Windows. The default may be to use IDE compatibility.

You MAY be able to set the BIOS to AHCI and then perform a repair of Windows 7.

Did you install all the drivers for your system? The newest graphic driver isn't always the best one to use. Depends on your card.

I am not a gamer so I can't help with the available tweaks to the DX settings.

Games that access the hard drive will benefit from AHCI settings. You may have been using AHCI before.

See the link below for possible help with AHCI.

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Related Solutions

August 31, 2012 at 19:37:13
In addition to the very good advice from OtheHill, you apparently have an inexpensive power supply. I know that it worked before, but your problems could very easily be your video card being starved for current just when it needs it the most. Your new BIOS, BIOS settings, or new GPU driver may be causing your components to draw just a little bit more power which could be pushing an already marginal situation over the edge. I could not confirm the amperage on the 12Volt rail(s), but from what I was able to gather, it would be marginal for gaming. A good quality 500Watt power supply should be plenty for your system, but you need to look for one that is 80% or higher certified efficient, has only one 12Volt rail, Has active PFC, and if from a quality name brand. Corsair, XFX, and a few others offer quality units in the reasonable price range. To get quality though, you really do need to spend a little more to get the power and reliability you need.

You have to be a little bit crazy to keep you from going insane.

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