Strange Results after installing new graphics card

[cooky560]

Basically I fitted a new graphics card into my lan party going machine and since then I've noticed a steady decline in my benchmark scores.

Before each test I restarted the machine and waited 2 minutes to allow it to finish booting.

My scores since I purchased the upgrade have been as follows:

On day of purchase: 7100

Test 1: 7060
Test 2: 7053
Test 3: 7048
Test 4: 7035
Test 5: 7029

I'm scared to run any more since I might be killing my graphics card, any ideas on what is happening?

Build
Intel i5 4670k 3.4ghz stock clock
8GB Ram
Gigabyte Windforce 3x oc Geforce GTX 770 4gb on factory clock of 1187 mhz plus nvidia boost
Gigabyte Z87-HD3 Motherboard
Corsair GS600 600 psu

 

[lude1962]

What test?
What HDD?
Timespan?

 

[CrixxzeH]

Turn the Nvidia boost off and then run.

 

[cooky560]

Sorry for taking such a long time to get back, been busy with work and other commitments

The test was 3d mark advanced edition firestrike
HDD is a seagate 1tb
Timespan over a few days

 

[adam98150]

Is it overclocked?

If so it could be unstable or perhaps it's generating too much heat.

 

[Aryuvei]

heat can slow down conductivity afaik, so maybe your graphics card is slowly becoming hotter, maybe dust is collecting?

 

[cooky560]

The case is dust free, as is the gpu, I ran gpu-z while running uniengine valley and the gpu never went above 70c