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Older Ryzen may not support SAM, old Intel might

https://www.techpowerup.com/275565/amd-ryzen-3000-and-older-zen-chips-dont-support-sam-due-to-hardware-limitation-intel-chips-since-haswell-support-it

 

Too lazy to do a news post, especially as it is hard to verify this article but I thought I'd throw it here instead.

 

Claim that Zen 2 and earlier can't support SAM due to a hardware limitation. So if you want that feature on AMD, you'd have to get Zen 3.

Also claims that Intel back to Haswell could support the feature (as generic resizable BAR). Now, the chances of getting bios updates that far back are zero, but it does keep the door open that recent generations might get it.

 

Of course, the CPU/mobo is only one side, we still need to see how wide GPU support will go. Has AMD stated any intent to get it working on previous generation GPUs? nvidia are reportedly looking at adding support to 30 series but no mention for older generations, as far as I'm aware.

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Gaming laptop: Asus FX503VD, i5-7300HQ, DDR4 2133 2x8GB, GTX 1050, Sandisk 256GB + 480GB SSD [link]


 

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3 minutes ago, porina said:

https://www.techpowerup.com/275565/amd-ryzen-3000-and-older-zen-chips-dont-support-sam-due-to-hardware-limitation-intel-chips-since-haswell-support-it

 

Too lazy to do a news post, especially as it is hard to verify this article but I thought I'd throw it here instead.

 

Claim that Zen 2 and earlier can't support SAM due to a hardware limitation. So if you want that feature on AMD, you'd have to get Zen 3.

Also claims that Intel back to Haswell could support the feature (as generic resizable BAR). Now, the chances of getting bios updates that far back are zero, but it does keep the door open that recent generations might get it.

 

Of course, the CPU/mobo is only one side, we still need to see how wide GPU support will go. Has AMD stated any intent to get it working on previous generation GPUs? nvidia are reportedly looking at adding support to 30 series but no mention for older generations, as far as I'm aware.

dumbass question

wtf is sam

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1 minute ago, Lord Szechenyi said:

dumbass question

wtf is sam

Smart Address Memory, the ability to allow the CPU to access all the GPU's VRAM at once and not in small chunks as commonly done currently. Can give some performance increase.

 

It is not a big deal not getting it, but it is free extra performance if you do get it.

Desktop Gaming system: Asrock Z370 Pro4, i7-8086k, Noctua D15, Corsair Vengeance Pro RGB 3200 4x16GB, Gigabyte 2070, NZXT E850 PSU, Cooler Master MasterBox 5, Optane 900p 280GB, Crucial MX200 1TB, Sandisk 960GB, Acer Predator XB241YU 1440p144 G-sync
TV Gaming system: Gigabyte Z490 Elite AC, i5-10600k, Noctua D15, Kingston HyperX RGB 4000@3600 2x8GB, EVGA 2080Ti Black, EVGA 850W, Corsair 230T, Crucial P1 1TB + MX500 1TB, LG OLED55B9PLA 4k120 G-Sync Compatible
Streaming system: Asus X299 TUF mark 2, i9-7920X, Noctua D15, Corsair Vengeance LPX RGB 3000 8x8GB, Asus Strix 1080Ti, Corsair HX1000i, GameMax Abyss, Samsung 970 Evo 500GB, Crucial BX500 1TB, BenQ XL2411 1080p144 + HP LP2475w 1200p60
Former Main system: Asus Maximus VIII Hero, i7-6700k, Noctua D14, G.Skill Ripjaws V 3200 2x8GB, Gigabyte GTX 1650, Corsair HX750i, In Win 303 NVIDIA, Samsung SM951 512GB, WD Blue 1TB, Acer RT280k 4k60 FreeSync [link]
Gaming laptop: Asus FX503VD, i5-7300HQ, DDR4 2133 2x8GB, GTX 1050, Sandisk 256GB + 480GB SSD [link]


 

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4 minutes ago, porina said:

Also claims that Intel back to Haswell could support the feature (as generic resizable BAR). Now, the chances of getting bios updates that far back are zero, but it does keep the door open that recent generations might get it.

Kinda sad. MSI has stopped releasing BIOS-updates for my Z370-mobo 😢

Hand, n. A singular instrument worn at the end of the human arm and commonly thrust into somebody’s pocket.

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Well, that's hilarious, if true... 

RYZEN 5 3600 | GIGABYTE 3070 VISION OC | 16GB CORSAIR VENGEANCE LPX 3200 DDR4 | MSI B350M MORTAR | 250GB SAMSUNG EVO 860 | 4TB TOSHIBA X 300 | 1TB TOSHIBA SSHD | 120GB KINGSTON SSD | WINDOWS 10 PRO | INWIN 301| BEQUIET PURE POWER 10 500W 80+ SILVER | ASUS 279H | LOGITECH Z906 | DELL KB216T | LOGITECH M185 | SONY DUALSHOCK 4

 

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21 minutes ago, porina said:

https://www.techpowerup.com/275565/amd-ryzen-3000-and-older-zen-chips-dont-support-sam-due-to-hardware-limitation-intel-chips-since-haswell-support-it

 

Too lazy to do a news post, especially as it is hard to verify this article but I thought I'd throw it here instead.

 

Claim that Zen 2 and earlier can't support SAM due to a hardware limitation. So if you want that feature on AMD, you'd have to get Zen 3.

Also claims that Intel back to Haswell could support the feature (as generic resizable BAR). Now, the chances of getting bios updates that far back are zero, but it does keep the door open that recent generations might get it.

 

Of course, the CPU/mobo is only one side, we still need to see how wide GPU support will go. Has AMD stated any intent to get it working on previous generation GPUs? nvidia are reportedly looking at adding support to 30 series but no mention for older generations, as far as I'm aware.

You actually can enable resizable BAR on older AMD CPUs (at least on Linux, no idea about windows), but there will be an increased latency due to the lack of the aforementioned instructions, resulting in worse performance than not enabling it for some scenarios.

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  • 1 month later...

hey, any news on SAM being supported by older gen CPU and GPU as well as b450 chipset?

saw bios update for b450 tomahawk max with " Support Re-size BAR function to enhance GPU performance" guessing that is SAM.

I'm on Ryzen 5 3600 and rx5700xt, and tbh not looking to upgrade any time soon since prices here are a mess... so just asking to know if I should get my hopes up at all?

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