Resizable BAR (ReBAR) Explained: Boost FPS on Nvidia & AMD GPUs

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Does Resizable BAR really boost FPS? I explain how Resizable BAR works and test ReBAR performance on Nvidia & AMD GPUs. For this, I benchmarked MW3, BF2042, Cyberpunk 2077, Rainbow Six Siege, and CS2 to find out which games benefit most from enabling ReBAR or smart access memory in the bios.
Resources:
[1] www.pcworld.com/article/394720/faster-gaming-frame-rates-for-free-resizable-bar-explained.html
[2] www.nvidia.com/en-us/geforce/news/gfecnt/20211/geforce-rtx-30-series-resizable-bar-support/
[3] www.reddit.com/r/nvidia/comments/13zes73/created_a_list_with_supported_games_for_nvidia/
[4] www.patreon.com/posts/look-at-modern-e-44371506
Timestamps:
00:00 Does Resizable BAR boost FPS?
00:33 Resizable Bar Explained
01:46 Nvidia ReBAR Support
02:33 AMD SAM Support
02:50 Tested Games & Caveat
03:49 Performance Graph Explained
04:31 Modern Warfare 3 ReBar Benchmark
05:50 Thanks for your support!
06:39 BF2024 ReBAR Benchmark
07:16 Cyberpunk 2077 ReBAR Benchmark
08:13 Rainbow Six Siege ReBAR Benchmark
08:56 CS2 ReBAR Benchmark
09:41 How to enable SAM on Asus
10:11 Check Smart Access Memory
10:26 How to enable Resizable BAR on Gigabyte
10:50 Check ReBAR on Nvidia
11:06 Conclusions
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6 окт 2024

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Комментарии : 90

@brgadoinks 2 дня назад

On warzone if you have a weak AMD CPU compared to your AMD GPU, you will lose performance. SAM actually eats up CPU performance to provide more GPU performance. This will make a CPU bottleneck. My 5700X3D + RX 7800XT performs better with SAM off. CPU time with sam off is 4-5ms; SAM on 5-6ms. GPU time is running at 4-5ms

@TechGuides 2 дня назад

Thanks for providing an additional data point! Pinned so others will also see this.

@amonx3579 День назад

Also in MW3 Zombies if you have SAM On, when you look at the middle of the map (Old Town) fps drastically decreases. SAM Off solves that. (Thanks to BeefyTech channel video)

@DrTopLiftDPT День назад

MW3 For 7900 xtx and 5800x3d I get 10% higher 1% lows with SAM off 220 vs 200, but 10% lower average, 300 vs 330.

@Super2wild День назад

Does anybody know how to disable SAM for specific game (warzone) because when i go in tuning and global u can disable SAM, , but when u have more games added for different underclocks etc... there is no option for SAM ... Thanks

@diegopulgarin-of1fx День назад

On urzikstan with 7800x3d and 7900xtx combo i get FPS drops from 300 to 20-40 every 4-5 seconds, is this bugged?

@zezima1956 23 часа назад

Tbh I only trust your tests as valid source. Other youtubers give as results like "I just prefer this" without any exact testing. Keep up the good work!👍 🙂

@amonx3579 День назад

thank you for your detailed videos! hope to see a video about "hardware accelerated gpu scheduling"

@TechGuides День назад

Cheers :) Thanks for the suggestion!!

@RodrigoMAOEE День назад

@TechGuides boosting the suggestion on HAGS too!!

@aceingaming9656 День назад

We need more people like you. I won't trust anyone without providing analysis on RU-vid.

@TechGuides День назад

Appreciate it

@Liid_d День назад

Thank you so much for your videos. I honestly trust your videos more than anyone else’s, simply because of how much you explain. I’m very thankful that you made this your hobby lol

@TechGuides День назад

Thank you so much for the kind comment :)

@HartenDylan День назад

Would be curious to see the AMD CPU/Nvidia GPU combo to see how similar/different it would be compared to the Intel/AMD combo. Great video overall!

@TechGuides День назад

I'd expect there not to be much of a difference to my Intel / Nvidia system but I'll try to test it sometime in the future :)

@FR33THY День назад

With the Nvidia system you need to use inspector to enable it in not official supported games. Especially mw3, enable in bios, game config and inspector, redo shaders. Did you do this? Also you should test warzone not the in game benchmark. Measure 0.1% lows you will see the game runs horribly on any system with rebar on. Even though it boosts fps in a gpu bound situation. 0.1% lows are much more important. With the amd system disabling in the driver doesn't work it needs to be done via bios.

@FR33THY День назад

(Bad 0.1% lows talking about mw3 exclusively)

@TechGuides День назад

Thanks a lot for watching man! Ah I see, so my results for MW3 on the Nvidia GPU are identical because MW3 not officially supported 🤦‍♂️ I didn't force ReBAR using the inspector and I also didn't benchmark in Warzone. Guess I will have to specifically test in Warzone on my all-AMD system to observe the 1% low issue. Frankly, I don't think forcing ReBAR using the inspector makes sense...

@diegopulgarin-of1fx День назад

On My system 7800x3d and 7900xtx i allways get FPS drops every 4-5 sec (with Sam on)

@coffeeberry625 День назад

Love your channel. Videos like this are the only ones worth watching. Finding optimized settings videos where everything is actually tested is difficult to find. Videos that provide dubious claims regarding performance improvements. There's just so much misinformation and garbage tier videos... It just isn't as click-baity unfortunately smh. Keep on going on! ✌

@TechGuides День назад

I couldnt agree more! Thank you for the super kind comment ❤️

@brinc3423 2 дня назад

Best channel

@TechGuides 2 дня назад

Too kind!

@simontemplar8719 15 часов назад

You said "Counterstrike2 ", subscribed for that game.

@TechGuides 7 часов назад

Awesome, I planned to do a full benchmark of all options for CS2 next week :)

@coin777 День назад

Thank You for the video!

@TechGuides День назад

Thank you for watching!

@ThiagoVieira91 День назад

Great technical video! Awesome data 💯

@TechGuides День назад

Cheers!

@gabriel.br997 7 часов назад

Great video, but what about the VRAM usage since it affects how the memory is accessed? Was there an increase or decrease?

@Dnizzle25 17 минут назад

Well let me just say I have the 7950X3D paired with RX7900XTX on ddr5 system memory of 32gb using resizeable bar and I must say ALL my game performance is phenomenal! The intent of that build is to blow away any and all future playstations! Yes I put alot of money into it but with all I can do with this amount of power is ridiculous! Although my setup is major OVERKILL but I wanted to blow the competition out the water!

@jggg31 День назад

@Game Guides 10900k DDR4-4400 & 7900XTX MW3, low settings, Game Benchmark At any resolution, with Rebar On, my cpu 1% lows and overall 1% lows drop all they way down to 130fps. With Rebar Off the 1% lows on cpu and thus overall 1% lows jump to 240 +fps. Rebar Off seems like the way to go for my system.

@TechGuides День назад

Yeah I observed exactly the same behavior on my Intel + AMD system!

@mad_mario_ День назад

Amazing video thanks alot! But didn't you want to add amd cpu+nvidia gpu combo? Would that make any change?

@TechGuides День назад

Thanks! I'd expect there not to be much of a difference to my Intel / Nvidia system but I'll try to test it sometime in the future :)

@RichardBejtlich День назад

This was great. I have AMD CPU and Nvidia 4070 Ti Super GPU. I’ll have to check if Rebar is enabled when I play Starfield.

@MARKELL00F День назад

Amazing work like you always do bro ❤ What about AMD CPU + Nvidia GPU ?

@TechGuides День назад

Thank you 😊 Didnt test it (yet)

@soulshinobi 15 часов назад

AMD CPU and Nvidia GPU would be the most popular configuration.

@DrTopLiftDPT День назад

MW3 in the benchmark with 7900 xtx and 5800x3d I get 10% higher 1% lows with SAM off, 220 vs 200, but 10% lower average, 300 vs 330. The CPU performance is way better better with it off since i dont have the best cpu

@edragyz8596 День назад

SAM does some extra things on top of changing the BAR size. It's been too long so I don't remember anymore but SAM was always a bigger performance improvement than Nvidia's solution. I believe it was also less likely to decrease performance as well but I could be making that up.

@TechGuides День назад

That seems to line up well with what I observed. Yes there are additional improvements over the BAR size for sure (also the Nvidia implementation)!

@marlo8850 День назад

Never heard of the RTX 4800

@TechGuides День назад

Shh dont tell anyone 🤣

@TheOneAndOnlySame День назад

Temu video card

@3_kids_one_shot726 2 дня назад

I knew it didn’t do anything. You’re right all tech channels “turn it on you’ll lose huge fps if you don’t”😂😂😂

@korosoid День назад

From my experience for competitive games: freesync off, rebar off.

@shaggytoph День назад

What about the "Core Isolation" option from Windows defenden in Windows 11? I've heard it's costing people 50 FPS on average if they turn it on. (Memory integrity)

@TechGuides День назад

Honestly I dont know about this option. Id be happy to do some research and check if a test would be interesting :)

@Sheerwinter День назад

Amd nvidia: rebar is useless. Intel arc: oke ...

@MostSaneOWPlayer День назад

hey so I enable resizable BAR but it doesnt say SAM is enabled in my AMD software. Any fixes?

@TechGuides День назад

Thats odd... There is another way to check if rebar is enabled: www.reddit.com/r/Amd/comments/l5jijg/comment/gkvfpy2/? check if it says "large memory range" in your GPU resource tab in the device manager. Still, I would probably try to re-install your GPU drivers

@user-pr9rh5ho8 День назад

why i have a problem whit i9-13980HX and RTX 4080 whe i use re-bar i have very big fps drops and dont know where can be the problem laptop is rog scar 16 whit rebar on fps drops for cpu to 130fps when re-bar off fps drops are to 230 fps

@TechGuides День назад

I personally disabled it on my intel & nvidia systems

@Wido_79 2 дня назад

Nice vídeo!

@TechGuides 2 дня назад

Thank you!

@Wido_79 2 дня назад

@@TechGuides I play Apex with Intel+Nvidia and resbar ON 1440p . Today disconnect resbar and test my game. Sorry,i'm Spanish. My english... XD

@TechGuides День назад

Let me know how it feels! Havent had time to check in Apex but would be interested as well :)

@Tristan-123 День назад

amd cpu + nvidia gpu would be interesting

@TechGuides День назад

Interesting, I havent considered that a popular setup but now Im also intrigued 😅

@Gershy13 День назад

I think it's one of the more popular setups. Especially with the older gen Ryzen (5000 series)

@shaggytoph День назад

@@TechGuides It's one of the most common setups tho. Best CPUs + Best GPUs, the best of both worlds.

@Progamer-jv8mb День назад

You missed very important pc setup based on amd processor and nvidia gpu, like my rig R7 7800X3d paired with RTX4090

@TechGuides День назад

I don't really expect this to perform different than my Intel + Nvidia system but if I have some time I could do some quick tests!

@Progamer-jv8mb День назад

@@TechGuides would be great, thank you

@banjovic День назад

What would be a good settings to play with i have a lot of input lag on warzone? I play 1440p with my 3070ti which is 100% bottleneck. I lowered the vram to 50 with low settings but i still feel a delay. V sync is off.

@TechGuides День назад

Hmm not really much of an idea other than: are you in fullscreen and have nvidia reflex on (not in on + boost!)

@banjovic 18 часов назад

@@TechGuides yes fullscreen exclusive with reflex ON. Do you know any good optimization tech who could help me setup my pc and bios?

@theanglerfish 12 часов назад

I have 4k so i presume rebar off will have less impact btw try amd system without massive cache cpus some games prefers these so much it even overcomes the negative impacts which rebar can have compared to cpus without x3d cache and results may vary also ddr4/ddr5 specifying this in your results also can help what to expect of that specific combination but i have Intel system i mean cpu and gpu and some ssds but even with Arc in one game it does not matter if rebar is on or off it does not care also going from 1440p to 4k 60fps locked gpu usage have the same average gpu usage and that's around 75-80% ...weird 😐

@nothingtoseehere1337 День назад

you need to make another test in all 4 maps in warzone, you will be surprised. on big map urzikistan BR/zombies you will get fps increase with rebar OFF and increase with rebar ON on smaller maps, i believe this works bad on big map that needs to load. thats why its so good in mw3 cuz they all tiny map.

@TechGuides День назад

Gotcha, I've read from a couple of viewers that the results are quite different on big map. I will likely do some tests on my AMD system (rebar in MW3 doesn't appear to be supported by Nvidia GPUs) and make a short about it 👍

@banjovic День назад

On or off i see no difference with my 3070ti, i tried config files with warzone and in the bios.

@TechGuides День назад

Seems like ReBAR in Warzone is not actually supported by Nvidia. Sorry for the confusion...

@SirHackaL0t. День назад

The list of games is 3 years old?

@TechGuides День назад

Fair point (minus MW3 and CS2) but I blame Nvidia for literally not supporting rebar in any new games 😬

@SirHackaL0t. День назад

@@TechGuides I would have thought it was down to the game engineers to design in the ReBAR.

@h1tten1t День назад

❤

@htoomyatlin123 12 часов назад

So for pure AMD system, SAM is better left on all the time

@TechGuides 7 часов назад

Unless you run out of VRAM apparently...

@Linets. День назад

👍👍

@randymcneely4983 Час назад

👍

@paulboyce8537 4 часа назад

Bit of a nonsense video because AMD/Nvidia architecture value CPU very little. So enabling REBAR has no effect. Same with E Cores +- 5%. So nothing. AMD/Nvidia architecture is mainly standalone single silicon architecture where CPU play a very small role. Almost all of the tasks are for the GPU. This means queuing and waiting and lot of errors when more is demanded. INTEL in the other hand via REBAR almost double the performance utilizing the CPU to split the tasks. A770 225W and 13th or 14th top INTEL CPU 253W max you see power and that means performance. But the current testing we use for single silicon architecture for AMD/Nvidia you only see half the performance of INTEL. Plus INTEL ARC architecture there is no queuing or waiting. Every frame is perfect. This is why A770 beats 4070ti at 4k. A770 experience to beat it you need +120FPS from 4070ti. And when we follow this to Battlemage that will have 250-275W and Arrow Lake on Z890 motherboard at 295W extreme we get 570W of performance. 5080 for example only has 400W and you can't count the CPU. Here is the catch Z890 board has PCI 5.0 with direct lane to CPU without restrictions. REBAR on steroids. So if Alchemist was missing a bit of optimal performance from pairing, Battlemage won't have any of that. It will effectively turn your graphics to dual silicon performance. It was already that with Alchemist but this will be a huge leap. Yet don't forget XeSS XMX is as good as DLSS and APO has a promise on supported games to give 10-50% boost.