In conclusion, flashing the reference 4 GB Radeon RX 480 to 8 GB works, if you're sure your card has 8 GB of memory physically present. The modified card was indeed able to address >4 GB of video memory on the card, just as it does on the 8 GB card. To make sure that each GPU runs at a predictable GPU frequency (usually thermal and power limit reduces clocks), we've set both fan and power target to maximum, which results in a constant frequency of 1266 MHz on both cards.Also, to prove that the game-test (COD: Black Ops III) was able to consume more than 4 GB of video memory on the modified card, as it does on our 8 GB control card, we observed the 'Memory Usage (dedicated)' graph of GPU-Z. The 4 GB card with its original retail BIOS produced 23.3 fps. The 8 GB control card produced 24.6 fps, the 4 GB to 8 GB modified card produced 24.7 fps.
The 8 GB control and the modified 4 GB to 8 GB card performed on-par with each other. This game can consume dedicated video memory beyond 4 GB at 4K Ultra HD (3840 x 2160). We ran 'Call of Duty: Black Ops III,' on the three. Lastly, we flashed this 4 GB card using ATIFlash with the 8 GB BIOS, which we extracted from our 8 GB card using ATIFlash. Next, we tested the retail 4 GB card with the BIOS it shipped with.
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Use at your own risk.To confirm that this mod works, we first tested our 8 GB review sample with its untouched 8 GB BIOS, and used that as control. The 8 GB card BIOS image which we used, can be found here. The trick here is to extract the BIOS of the 8 GB card with ATIFlash 2.74 and then transplanting that BIOS onto the 4 GB card. We flashed this card with the 8 GB card's BIOS, and were successful in doing so. We first discovered that our 4 GB retail card had the same exact Samsung 8x 8 Gb chips (including the same bin, specc'd for 8 Gbps) as the 8 GB card.
We currently have an AIB partner-branded retail 4 GB Radeon RX 480 card which we bought online (invoice posted), and which we're using to prepare our 4 GB RX 480 review. AMD's claims of 4 GB cards with 8 GB physical memory being restricted to review samples was proven false when early adopters of retail 4 GB cards discovered eight Samsung 8 Gbit memory chips on their card amounting to 8 GB. Short answer: retail 4 GB RX 480 can be flashed to 8 GB, and the modified card perfoms on par with the 8 GB variant.ĪMD sent out review samples of the 8 GB variant, and to enable reviews to also put up reviews of the 4 GB variant, it sent a special BIOS that converts the 8 GB card to 4 GB, by reducing its address-space and memory clocks, perfectly simulating the 4 GB variant. In its Reddit AMA, the company presented a vague answer to the question of whether such 4 GB cards are moddable to 8 GB by flashing it with the BIOS of the 8 GB variant, by stating that the ability to mod is restricted to review samples. Earlier this week, we heard reports of some early adopters of the 4 GB variant of AMD Radeon RX 480 claiming that their cards shipped with 8 GB of memory physically present on their cards, but their graphics card BIOS somehow prevented the GPU from addressing more than 4 GB of it.
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