New AMD drivers enable Smart Access Memory on Radeon RX 5000

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Horus-Anhur:

So what, I can enable or disable ReBar on my motherboard in less than a minute. If I'm playing a game that has a benefit, I would just turn it on.
nope, if your 2070S has Re-Bar BIOS, it won't boot when you disable Re-Bar in the BIOS, I have tried. So it's a no go if you don't have dual BIOS GPU Even if your GPU has dual BIOS, it's still a pain to flip BIOS.
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Horus-Anhur:

So what, I can enable or disable ReBar on my motherboard in less than a minute. If I'm playing a game that has a benefit, I would just turn it on.
turing has no support for sam so even if you do enable in the bios does not mean it works. I can also enable on the rx580.
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Well its on in bios and drivers here but gpu-z still says hardware not compatible
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Krizby:

nope, if your 2070S has Re-Bar BIOS, it won't boot when you disable Re-Bar in the BIOS, I have tried. So it's a no go if you don't have dual BIOS GPU Even if your GPU has dual BIOS, it's still a pain to flip BIOS.
I didn't know that. That's more of an hassle. But still, it would be good for me, because the games I like, would benefit. It would be nice if nVidia gave ReBar support on Turing, like AMD did on older cards.
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Cplifj:

AMD fine wine ?? Where is the fine wine on VEGA ??? It never happened, offcourse it didn't because i happen to have bought one, same crap as it ever was. Nothing for this one, everything for the rest. Know how lucky most of you seem to be with you actually getting what marketing sheits promised you. It's not like an ASUS does any better with leaving crap disabled to make more money on twenty different obnoxious motherboard itterations of the same, but each option that is build in must be payed for to be unlocked.....The complete industry are douchbags for money, that's all that always remains of anything. Also bugs that still have to get fixed after the cards are succeeded (a few times) already, that ain't quality at all.
Far as I know those cards still run really great and did improve their performance over time. But sure, they won't be getting this, likely. Nor will the RX400 series.
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AlmondMan:

Far as I know those cards still run really great and did improve their performance over time. But sure, they won't be getting this, likely. Nor will the RX400 series.
They did. There are features missing with gcn but Polaris and Vega performance improved quite a bit over the years. He should be happy but let him have his little rant.
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Cryio:

Tested HZD with driver 21.8.2 (ReBar not officially supported, but enabled in BIOS anyway) and 21.9.1 (Rebar now officially supported in driver) on my 5700 XT. Close to zero differences. Same average. Max FPS some 14 fps higher (130 vs 144 I believe? with my tested settings), min FPS increased from 2 fps to 42. Meh overall.

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min FPS increased from 2 fps to 42. Meh overall.
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Well Well, Just played AC Valhalla for a while In the benchmark lows haven't changed by more than a few fps from 46 - 49 BUT gameplay is smooth as hell Solid 85fps locked with RTSS
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I barely even game anymore, but I'm thrilled anyways. I'm gaming at, effectively, 3K (3440x1440), and this 5700XT could use all the help it can get.
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I don't trust the Minimum fps metrics in the HZD benchmark. Dunno why y'all are so amused, lol.
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This is really interesting! When Resizable BAR or Smart Access Memory was announced it required a motherboard BIOS update and VBIOS update for this to work. To date a few games support this technology, both I wasn't expecting it could be done on a driver level...NVIDIA please enable this a similar option on GeForce 10, 16 and 20 card (If only on 20 cards) so that we can experience a free boost to performance.
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MachinaEx:

both I wasn't expecting it could be done on a driver level.
1> its not done on a driver level 2> AMD bundles VBIOS/Firmware in the Driver package.
MachinaEx:

NVIDIA please enable this a similar option on GeForce 10, 16 and 20 card
not gunna happen
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Horus-Anhur:

It would be nice if nVidia gave ReBar support on Turing, like AMD did on older cards.
Keep on dreaming lol - on their end there's absolutely no reason to do so, any card they release will sell like hotcakes it just doesn't matter for them who exactly buys the card. If you as a gamer cannot get a new GPU then it's your problem and they have 0 care on increasing value/staying power of existing cards when there are new ones to push with zero effort.
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I wonder when SAM will be accessible in Linux?
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ManofGod:

I wonder when SAM will be accessible in Linux?
already is.
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AlmondMan:

I guess the whole "fine wine" meme continues on. Looking forward to trying this out. Hopefully I won't need any VGA BIOS updates.
Vega 😉
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Astyanax:

already is.
You mean my R7 3700X with 5700 uses SAM already on the 5.13 kernel?
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ManofGod:

You mean my R7 3700X with 5700 uses SAM already on the 5.13 kernel?
amdgpu Linux kernel driver supports entire VRAM visible to CPU ("Above 4G Decoding") for years. Then there are userspace drivers (Vulkan & OGL) taking advantage of this (which is "SAM"), all relatively recent versions of drivers (RadeonSI, RADV and AMDVLK) support this. It is enabled by default when SAM is enabled in bios. You can also force it (the SAM part, but not all VRAM visible to CPU) on/off with at least RADV via environment variable and there also is a driconf setting for RadeonSI. See RADV_PERFTEST=sam/nosam https://docs.mesa3d.org/envvars.html#radv-driver-environment-variables Afaict, this applies to all GPUs supported by the drivers, as long as dmesg reports BAR size >256MB (from what I've heard, even old AMD cards like Fiji, Tonga etc. don't have a vbios limitation here, unlike "old" Nvidia cards like Turing).
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At first Resize bar was depicted only running on RX6x00 GPU and R5x00 CPU. It is now officially compatible with RX5x00 GPU. But what is it's CPU status ? If we have a compatible motherboard (X5x0 or some X4x0), does that mean that whatever CPU from R3x00 and R5x00 is suitable ? It's essentially a rhetorical question because I have a Vega 64, so, even if my R3800X is good, my GPU is not ; and will certainly never be. Pfiooo !That makes a big amount of "x" in my message ! :-p
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^^It works for me with a x570 board, a 3800X CPU and a 5700XT GPU.