RX480 4GB or 8GB

boysie

I c the 4GB is 1000MHz slower memory but also around £45-£50 cheaper...

For mining 8GB is just not needed and Mem is nearly always underclocked...so why get the 8GB card?

Boysie

bbcoin

Games and rendering?

work

Because of the low memory bus width on the RX 480, memory clock rate is the bottleneck. For mining, it appears overclocking memory and probably downclocking core clock will see hashrate increases. It looks like for Ethash mining, 8GB cards will be king.

There's also word about a 9GHz memory overclock "limit," although don't know much yet.

Heliox

work said:

Because of the low memory bus width on the RX 480, memory clock rate is the bottleneck. For mining, it appears overclocking memory and probably downclocking core clock will see hashrate increases. It looks like for Ethash mining, 8GB cards will be king.

There's also word about a 9GHz memory overclock "limit," although don't know much yet.

Will see tomorrow,

boysie

do'h! ok I have 4x 480 4GB coming so lets hope I can rinse them for their value...plus got them at £175 so maybe will be ok....once I have some benches on Friday evening I can compare to the 8GB version you are all getting

Logicaluser

@work I was thinking the opposite, that we might want to underclock memory for tighter timings.

After all... some 380X can hit ~24mh @ 1625mhz memory, and the RX480 should be outperforming it based on specs, but thus far is not....

Rimtu

This card could be interesting after all... it seams that with memory OC it can easily achieve 28MHs with little more power usage
http://cryptomining-blog.com/8033-testing-the-amd-radeon-rx-480-for-ethereum-mining/

boysie

hmm but what is the memory overclock options for the 4GB?

boysie

anyone got results from the 4GB yet?

work

@boysie there's very low availability to 4GB cards at the moment. It sounds the existing batch of 4GB cards are using larger/faster chips because of RAM shortages, so they should overclock the same as an 8GB model. This probably won't be true of later batches, and maybe not all cards in the first batches.

If there are 4GB cards available right now near you, I'd buy them all. 0 available in Canada right now from what I've managed to find.

Heliox

in stock over here though, those 4GB ones.. thinking about getting some tbh..

bbcoin

Heliox said:

in stock over here though, those 4GB ones.. thinking about getting some tbh..

wait for the 470

Sequoia93

It is my understanding that the 4GB models ships at 7000 and the 8GB model ships at 8000, but they both have a limit of 9000.

So I would assume the 4GB may underperform out of the box, but can be clocked to perform just the same as the 8GB model.

Does anyone agree? Or am I missing something?

boysie

not only that it seems the 4gb have 8GB ram exactly the same as the 8GB in speed and size/chip but the bios has been hobbled...I feel a reflash coming

akropiss

@bbcoin Any rumors as to when that will be?

bbcoin

akropiss said:

@bbcoin Any rumors as to when that will be?

mid-end of July, together with aftermarket rx 480
You have to understand that both rx 480 and rx 470 have mini ITX PCB which makes it logical for other companies not to use the cheap shit plastic blower but put a nice heatsink+fan and offer it in the same format as Nano and that's what I'm waiting for.