OCC has published a new review on the Gigabyte EP45-DS3R

Overclocking this board felt exactly the same as overclocking the Gigabyte EP-45 Extreme. The only difference is that the multiplier had to be 6 on this DS3R whereas on the Extreme I could take it to 7. I was able to obtain a front side bus of 500MHz, which is quite good. I definitely could have gone further but the memory was holding me back. As much as I fought, I wasn't able to get anything higher than 500 x 6. I tinkered with the memory until it would finally pass MemTest and Prime 95 in Windows. Overall, it was easy to overclock but the memory was holding the motherboard back.

Gigabyte EP45-DS3R Review