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Linking my previous posts regarding this for clarification : Post 1 | Post 2
The information out there is conflicting in many different ways, AMD advertises SAM as it is supported on
500 series motherboards Ryzen 5000 series CPUs 'Select' Ryzen 3000 series CPUs Radeon 6000 serieBut they have now released an update to support Radeon 5000 series GPUs as well, not only that but many motherboard manufacturers released SAM support on 400 series motherboards too. Now the question that remains is the support for older CPUs (Zen/Zen+). Some board partners like Asus released BIOS updates to support that but the feature actually working and providing any sort of improvement is still a mystery for older gen CPUs. AMD software and BIOS may show it as active but GPU-Z / Device Manager shows otherwise for some users and data is all conflicting with FPS results on tested games (in the comments on the linked posts)
So i took the question to AMD tech support and received a straight forward reply,
"No, SAM does not support for Ryzen 2000 series CPU to check the min system requirements please visit AMD Smart Access Memory | AMD "
The reply
I guess we can finally come to a conclusion that Zen/Zen + are not supported.
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is it just me or are people thinking SAM is a giant performance boost? I've gamed with and without it and haven't noticed any difference.
ID: hen938fID: hephj9rWell, most reviews pointed that and the fact that this will be usefull in future games.
But....you know how it is, rumor mill started on full power 🙂
ID: heoakxkWeirdly, the game that has benefited far more than any other from SAM is Wreckfest. So much so to the point I think there's something wrong with either the game or the driver.
There are spots that were running at a steady 80-90 FPS that are now running at a steady 210-220 FPS. It's kinda ridiculous.
But Wreckfest is the only game where I actually notice a significant performance difference that doesn't rely on actually looking at an FPS counter.
ID: hem97knDepends on the game. In Forza Horizon 4 for example there's a tremendous FPS gain using SAM on the 5700 XT
ID: hel5jrsThe FPS lows are waaaayyyyy better for many games that I play.
ID: helbt75Warzone for example. At least for me. 5900x & 5700xt.
ID: helcfmkFrom my experience, I can't say there is a noticeable performance boost but I think it helps make certain games run much smoother with SAM.
ID: hemdmnq10-15% improvement for in Cyberpunk.
Helped propel 6800XT over 3090,
ID: henfdg5I'm getting games running with more stability since they aren't limited in resource access and loading times.
ID: heo6uebIt is in some cases.
ID: heok0r7Like anything, if you don't have a fps meter to look at you wont notice a gameplay difference normally. Its why people cant notice differences between a $2000 card and a $1000 card.
ID: herin3gGives me 10 FPS extra in RDR2 at ultra settings. Very much worth it for me.
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It works on older stuff but amd doesn't say it's official support.
It's like how 3200mbps is officially max ram for my recent 3600 but I have 3733mbps running fine.
ID: hemteldOfficial support = 3200 MT/s JEDEC, and has nothing to do with the XMP'ability of the AMD platform.
ID: helclod3733 mbps would be awfully slow lol you mean MT/s?
Interesting, I’ve been running 3600mhz DDR since launch with XMP.
Yes most people can run 3600 but only 3200 is official.
This was true on DDR3 systems in the past too. Intel claimed only 1600mt/s support on Haswell but anyone can get over that.
Hmmmmm.....
So it just says "active" both in the AMD software AND GPU-Z but in fact it's inactive?
I am running a test today with c7h wifi with one of my old modded bios with pcie 4 with my 2700x. I will see about SAM and or rebar support can be enabled as well.
SAM has work on my 6800xt on newest bios but for my 5700xt I could enable the rebar but not working until the latest gpu driver. The 6800xt has been enabled for a while now.
Rebar has been around for years, and supported in Linux. Just not in the driver's for windows. All clicking rebar on or off is just an easy way to turn 2 or 3 settings in the bios to correct things.
SAM has additional optimization by AMD on the drive
hardware for rebar.Edit. I am having a he'll of time find the bios that had the pcie 4 in on the x470 and 2700x.
Though I did remember above 4g decode is a option I never displayed. This option requires some hex editing to access. Though I know I did it in one of my bios just that I have a ton of modded bios and only one was actually selectable in just one bios.
Last edit I gave up on finding that beta bios and proceed with my total tear down of my system. Will not finish until sometime tomorrow.
Did you run benchmarks before and after the SAM on X470 + 2700 combo? Any improvements?
Maybe but do not recall. Not done much with pcs in over a year. Was diagnosed in March 2020 with both carpal tunnel and Cubital tunnel syndrome in my mouse hand and arm.
Only recently started going back into my PC room. I was passed at everything since my Drs will not allow me to game. I started mining on it so rarely looked at it. I had parts on riser cards.
In the middle of a big tear down moving both my 5700xt and vega to separate rig. My drs are going to allow me 4 to 6 hours a day with lots of breaks away from my PC.
So I am playing a lot of catch up from the last year and a half with pc tech.
I will say I caught something in the bios dealing with rebar that is hidden for now.
When will people learn that T1 support for companies are required to quote official documentation?
No, it's not supported. But you knew that already from the official website.
This does not conclusively disprove if it works.
Kind of like how some 300 series motherboards accidentally work with Zen3. Or how a Chinese manufacturer can whip up a motherboard with the previous generation's Intel chipset that not only works with the newest CPU but also has DDR3.
Exactly - this is just a random AMD level 1 support person, sending a generic reply that basically states AMD's official support.
They even re-direct OP to the generic page for SAM support.
When will people actually read the stuff that are linked and form a diplomatic opinion?
Since you choose to be ignorant, let me clarify this. I thought it wasnt supported untill recently when I started seeing people with Zen+ posting that its fact working on their rig, which is why i posted earlier and its all over the linked posts.
You need to re-read the person's post you replied to. They VERY CLEARLY talked about the difference between "supported" and "works." You are completely missing this point, and it is a vital one. Sit your ass down and drink some water.
I'm pretty sure it's mainly the motherboard that matters. As you can use Intel CPU and AMD GPU and then get 'resizeable bar active'. So it might not be SAM exactly, but you will get performance differences.
I'm happy AMD Tech Support replied to your request... still no luck for me and Ryzen Master not launching... 🙁
It's your registry entries, do some googling and get rid of duplicates or '??' version within the Ryzen master registry entry.
Thanks for your replay, but I've already tried the registry cleaning solution... but error message is still there. Moreover, I don't have that key in my Registry, but still tried to unistall RM, clean the Registry and reinstall back... no luck.
Problem popped up after upgrading to latest chipset driver. AMD should provide a definitive solution to this long-term problem.
SAM seems to work fine on my B450 Tomahawk MAX and 2700X. What are they on about, it shows that is active when it's not ?
No, resizing the basic address register is a very old optional feature of PCIE. The reason why AMD only officially supports it on newer motherboards is simply because it used to be a niche feature that noone cared about and motherboard manufacturers often either didn't name the option correctly in their bios UI, didn't include any helptext for it or plain didn't include the option to enable it at all.
The reason why it used to be disabled by default in bios is that a number of old PCIE devices had not been tested with this feature and could start failing because they relied on noone ever caring to enable it. It seems most modern cards support correctly defining valid memory ranges, so it remain off by default merely for historic reasons.
AFAIK the only difference between then and now is that AMD updated the documentation material given to motherboard manufacturers to state that the setting must be shown to the user, could have one of two names (BAR resizing or SAM) and a suggested helptext to describe the setting. And a hell of a lot of PR material for the press, which is fair enough given that AMD spent time digging up the usefulness of the feature and validating it against Radeon Technology Group's cards.
I swear in january or some other months people posted zen and zen+ with SAM supported on 400 series and saw uplift in games from 60 to 86 fps or even more. Maybe im wrong but i know people posted it
It has been hyped to hell while the actual difference is about 2% on average. I think it was hardwareunboxed that tested more than 40 games and found on average the difference was about 2%.
You will obviously find some games where the difference is greater and some games where enabling SAM will make the game perform worse.