Question / Help Framerate problems on local recording

Ashelor

New Member
First of all, wanna say I'm a complete newb when it comes to recording software.
Tried fraps back in the day, but it took too much space and i never had a separate HDD for recording so every recording looked choppy and my frame rates were awful.

I mostly play WoW, and a guildie suggested i try obs.
So far I'm very impressed by the small size of recordings i get.
However i have a frame rate problem which imo shouldn't happen cause my machine should be more than able to handle WoW + recording

My setup is:

MBO: MSI Z77A-G45
CPU: Intel Core i5 3570K
RAM: 8Gb DDR3 (2x4Gb) G-SKILL Ripjaw @ 1333 Mhz
GPU: Sapphire Radeon HD 6950 Dirt 3 Edition (double fans) 2Gb GDDR5

GPU is slightly clocked and CPU is working on stock clock

WoW is installed on C disk which is an Samsung SSD (120Gb), and recordings are saved on F disk which is actually partition of my old C disk (just a regular Seagate 7200 rpm HDD)

In WoW my fps is locked to my screen refresh rate (60fps), and on ultra settings it goes down to probably 30-40 during intense events e.g. start of a boss fight, or AoE fests with huge amount of mobs and effects, however game is always playable and frame drop is barely noticable.

However as soon as i start recording my fps gets locked to 30 fps and then tanks to like 10-15 during those intense stages, with spikes that go even lower.

Which results in choppy recording and barely playable game (well it's playable but i hate playing like that)

I setup the encoding to 30 fps as a certain guide said, and Kb/s to 30000 (so cca 30mb per sec for good picture)

My machine should be good enough to record a video without tanking my fps so much (especially in WoW)

Any ideas why fps gets nuked so much?
 
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