OC'ing / Pushing my vega56 to the Max
Hey guys! I recently picked up a Gigabyte Gaming OC Vega 56 off ebay for $230 listed for parts or not working. These gigabyte cards are INFAMOUS for being garbage. Anyways, the card still was under warranty, so I RMA'd it and just got it back, works great, been OCing it, and I've already flashed a Vega64 bios (Gigabyte gaming OC) Undervolted 100mv, +50% power limit and 1630mhz core, however I got unlucky and got the Hynix HBM2, only able to get it to 885mhz stable. Any recommendations on pushing this card further? I'm scoring a combined score on Firestrike of 18,500 with a R5 2600 at 4.0ghz.
It's running a different power delivery than reference if I recall correctly.
Yes it is. Basically Gigabyte decided to dump some money into the GPU cooling (they put a heatpipe into the backplate as a result of the power design) and then cheapen out a bit on the power delivery with two AON6360 as a replacement of sorts of the IRF6894. It isn't as big an issue for gaming or whatnot, but being the only card setup with that sort of power delivery means you inherently use more power. The thermals don't reflect the losses as much since they used 2x low side fets but if you look at Sapphire Nitro results they're at least 10°C cooler even on Vega64.
3mΩ @ 10V , 5mΩ@4.5V V_GS
7mΩ @ 10V, 11mΩ@4.5V V_GS
Reference uses IRF6894 and IRF6811. The IRF6894 has a 0.9 mΩ RDSON @ 10V , 1.4m mΩ @ 4.5V and the IRF6811 has 2.8 and 4.1 mΩ resistance respectively. Q_G (total gate charge) for IRF6811 high side fet is extremely low at 11nC , which means switching is less lossy.
If you look at other nonreference designs such as the ASUS STRIX version , it's using 60A IR powerstages (https://www.photopoint.ee/en/compute...vega-56-oc-8gb , https://www.hardocp.com/article/2018...aming_review/3, details gained from VEGA64 version https://www.hardwareluxx.de/index.ph...t.html?start=2).
Powercolor's Red devil is essentially the reference design: https://www.guru3d.com/articles-page...-review,4.html , https://www.hardwareluxx.de/index.ph...t.html?start=2
XFX's Double edition is basically reference Nano with cut down the phase count to 8 (instead of 12): https://www.overclock.net/forum/26648417-post5895.html , https://hardforum.com/threads/xfx-ve...vesty.1953602/
Sapphire's RX VEGA NITRO series is 14 phases up from the 12 on reference.
Sapphire also has a RX VEGA Nano based "Pulse" that has a conservative power limit (minor bump from reference) https://www.computerbase.de/2018-03/...as_winzige_pcb
One issue with the reference Vega 56 in general is that the only aftermarket cooler options are pretty much the Raijintek Morpheus II and waterblocks of some sort (whether they are Asetek AIOs , Alphacool Eiswolf AIOs, or full custom). This is due to HBM memory and the VRM layout. Arctic Accelero Xtreme air cooler doesn't seem to work apparently (that is an option instead of a waterblock for a Nvidia card).
I feel as though Sapphire was the only vendor that did VEGA56 and VEGA64 justice. They have one conservative card that's one centimeter longer than reference and an overkill overclocking powerhouse with 3 PCIE power connectors and a massive triple slot heatsink that only needs ~1200RPM fan speed.
Alphacool has a block for the Gigabyte luckily for you but it isn't easily purchasable and has 2-3 week leadtime:
There's no blocks from EKWB so I doubt the other manufacturers will make one:
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