Heaven bench score goes down when oc'ing Strix ROG RX 580?

[jonmakela00]

i5-4690k oc'd to 4.4ghz
Cryorig H7 Quad Lumi cooler
Asrock Z97 Pro3 mobo
Asus Strix ROG RX 580 GAMINGOC graphics card (1360 stock speed)

Installed the card tonight, ran Heaven for a half hour then ran several benchmarks using stock and a couple oc's and my Heaven scores were worse after oc'ing.

1360mhz/2000mhz = 89.3/2249 (twice) and 88.2/2221
1405mhz/2000mhz = 79.8/2011 and 79.9/2012 (bumped power limit in amd settings to
1425mhz/2100mhz = 81.9/2063

Using HWMonitor I paid attention to whether the card was throttling speed, temps, etc. Temps stayed right about 52c - 56c throughout.

This is so odd to me.

I did the same tests using my other XFX RX 580 card and saw steady bench score improvement as I upposed the oc. Interestingly, this Strix card at stock speed had a +200 score on the XFX (XFX oc'd at 1445mhz).

Am I missing something here?

Heaven:
Quality - High
Tesselation - Normal
AA - 2x

Appreciate any insight.

 

[jonmakela00]

Re-ran Heaven several more times, both at stock and oc'd and still similar results. Best heaven scores at stock speed and settings and those results get worse as an OC is applied. Weird.

 

[NeedPeeling]

Solved it yet?