AMD Ryzen 7 7840U Performance Benchmarks on Linux • Hacker News Board

Re: AMD Ryzen 7 7840U Performance Benchmarks on Linux

#61

Post by AnthonyMouse » Sun, Jul 09, 2023, 2:50 PM UTC

hospitalJail wrote: post #32

shmerl wrote: post #8

So when are Lenovo Thinkpads with such chips coming out?

Can anyone explain why so many people want this? If I am running a beefy single threaded or multi program with CPU, I want the best, not some low power device. Gaming laptop.(Or whatever we want to call it) If I'm running consumer/enterprise software, I likely want a beefy GPU. Gaming laptop.(Or whatever we want to call it) If I'm taking a 7 hour bus ride in a bus without a 120V outlet, I want this. If I'm taking a 6…

Higher power also means it has to dissipate more heat, so it has to be heavier. And we're not talking about a couple of grams to have an ethernet port or an M.2 connector instead of soldered storage. You need a bigger heatsink, which is made of metal and dissipates heat in proportion to how much mass it has. They typically also have bigger, heavier batteries and power bricks. And you then have to dissipate the heat from discharging the battery at a faster rate.

They also have to dissipate the heat into something, which is often the chassis, and therefore your lap. Not fun in the summertime.

The higher power chips are only significantly faster on threaded workloads, so if most of your applications are poorly threaded it's a trade off in exchange for almost nothing.

Re: AMD Ryzen 7 7840U Performance Benchmarks on Linux

#62

Post by helf » Sun, Jul 09, 2023, 2:56 PM UTC

kalleboo wrote: post #47

Tade0 wrote: post #25

Earlier quoted context omitted.

I suppose some of it can be attributed to general unpleasantness of 37°C and impatience that comes with it, but I have another data point: A while ago my laptop started running around 10°C hotter than it should have - turns out the iGPU was going wide open throttle for no apparent reason. What I found was that CPU-intensive tasks slowed down as well, because those 10°C make a huge difference in terms of when the CPU…

I live in Asia and summers are routinely 37 C. Apple's new chips are a GODSEND for laptops. My old Intel laptops would nearly instantly thermally throttle under any trivial load without air conditioning at full blast and a fan aimed at the machine.

I live in Alabama and I cannot imagine places that you can happily exist in without AC.

It routinely hits 37-40C here during the summer /and/ 80%+ humidity.

A week ago it was ambient temp 39C with a Heat Index of 45C.

I hadn't thought about the Apple Silicon being a pro in that environment but now I'm tempted to get one lol.

Re: AMD Ryzen 7 7840U Performance Benchmarks on Linux

#63

Post by beebeepka » Sun, Jul 09, 2023, 3:01 PM UTC

curiousWaste wrote: post #58

I have currently 7300HQ based laptop. Would this provide good perf improvement to web dev, primarily based on vite, or is it bottlenecked by something else. Currently its somewhat sluggish but I guess its not worlds end.

It's going to be night and day for sure. Your CPU wasn't great when it launched.

I have several Ryzen laptops, including a 6800H. The thing is as fast as the latest and greatest from Apple, although with a bit worse battery life. I get about 12 hours in Linux with Gnome. Very quiet. The fan turns on only during gaming, or prolonged compiling.

The mobile Ryzen 7000 line is a bit messy, though. If you want the Zen 4 stuff, you need to look for a 7x4x model, such as the 7840 from this article.

7 is the generation.

4 indicates that it's a Zen 4 part. There are many 7x3x parts on the market because they are simply rebranded Zen 3 (5000 and 6000) parts.

Re: AMD Ryzen 7 7840U Performance Benchmarks on Linux

#64

Post by esperent » Sun, Jul 09, 2023, 3:16 PM UTC

kalleboo wrote: post #47

Tade0 wrote: post #25

Earlier quoted context omitted.

I suppose some of it can be attributed to general unpleasantness of 37°C and impatience that comes with it, but I have another data point: A while ago my laptop started running around 10°C hotter than it should have - turns out the iGPU was going wide open throttle for no apparent reason. What I found was that CPU-intensive tasks slowed down as well, because those 10°C make a huge difference in terms of when the CPU…

I live in Asia and summers are routinely 37 C. Apple's new chips are a GODSEND for laptops. My old Intel laptops would nearly instantly thermally throttle under any trivial load without air conditioning at full blast and a fan aimed at the machine.

I also live in Asia (Vietnam) and my previous two laptops have had Intel chips (current: MSI GE66 i7+3070, previously an old Clevo with a 970m). I've never had noticeable thermal throttling even when running in very hot summers in rooms with barely functioning AC (which is basically every room here). My northern European body struggles - a lot - but I haven't seen my laptops being much bothered. I do a lot of intense 3d work, I would notice if it started throttling. Maybe the problem was your laptop?

Re: AMD Ryzen 7 7840U Performance Benchmarks on Linux

#65

Post by zbrozek » Sun, Jul 09, 2023, 3:16 PM UTC

Kelteseth wrote: post #2

Still waiting for my amd framework Laptop. They said early Q3. It would be the perfect machine for some nice summer coding on my balcony :*)

Ditto. My current laptop is starting to get flaky and I'm getting increasingly itchy for a replacement, so I might start looking for quicker-shipping alternatives.

Re: AMD Ryzen 7 7840U Performance Benchmarks on Linux

#66

Post by treesciencebot » Sun, Jul 09, 2023, 3:19 PM UTC

pmoriarty wrote: post #50

ChuckNorris89 wrote: post #5

For those unaware, this isn't AMDs top of the line laptop chip, but the top of the line ultra low power laptop chip. It's meant for ~15W thin and light devices, not thick gaming laptops, AMD has 35W parts for those.

What are AMD's top of the line laptop and desktop chips?

7950X for desktops, 7945HX for laptops. Pretty similiar in terms of the compute functionality (16C/32T) although the base clocks and TDPs are different (4.5 GHz for desktop, 2.5 GHz for the laptops as the base clock -- they both can boost much higher).

https://www.amd.com/en/products/cpu/amd-ryzen-9-7950x https://www.amd.com/en/products/apu/amd-ryzen-9-7945hx

Re: AMD Ryzen 7 7840U Performance Benchmarks on Linux

#67

Post by blacksmith_tb » Sun, Jul 09, 2023, 3:20 PM UTC

hospitalJail wrote: post #45

KeplerBoy wrote: post #37

Earlier quoted context omitted.

Why would you want a beefy GPU in anything except a gaming laptop or full blown workstation replacement? Also on the bus ride. I certainly wouldn't want to unpack a 17" gaming laptop on a bus of all places. You couldn't use a external mouse anyways. There I'd want a steam deck or Nintendo switch.

What is a better word for a laptop with good specs? "High end laptops" are usually garbage when I search for them. 19" monitor and a 3060 for $2000, RGB keyboard 512GB ram, 16gb Ram. I just use the word gaming laptop because you can get high quality stuff for under $1000, or you can get ultra high quality for $3000 like a 4090. I don't actually play games. Its a shortcut word.

"Mobile Workstation" is what the PC industry generally calls big, heavy machines with discreet GPUs, but not all the leet stickers / RGB of a gaming laptop. They're pitched to people who CAD, for example.

Re: AMD Ryzen 7 7840U Performance Benchmarks on Linux

#68

Post by curiousWaste » Sun, Jul 09, 2023, 3:45 PM UTC

beebeepka wrote: post #63

curiousWaste wrote: post #58

I have currently 7300HQ based laptop. Would this provide good perf improvement to web dev, primarily based on vite, or is it bottlenecked by something else. Currently its somewhat sluggish but I guess its not worlds end.

It's going to be night and day for sure. Your CPU wasn't great when it launched. I have several Ryzen laptops, including a 6800H. The thing is as fast as the latest and greatest from Apple, although with a bit worse battery life. I get about 12 hours in Linux with Gnome. Very quiet. The fan turns on only during gaming, or prolonged compiling. The mobile Ryzen 7000 line is a bit messy, though. If you want the Zen 4 st…

Thanks, might upgrade to lenovo yoga slim 7 when it comes available. It has 7840u and oled screen. I was just looking oled laptop screens on electronic store today. It looked great even text which some say looks poor on oled.

Re: AMD Ryzen 7 7840U Performance Benchmarks on Linux

#69

Post by Tade0 » Sun, Jul 09, 2023, 4:16 PM UTC

esperent wrote: post #64

kalleboo wrote: post #47

Earlier quoted context omitted.

I live in Asia and summers are routinely 37 C. Apple's new chips are a GODSEND for laptops. My old Intel laptops would nearly instantly thermally throttle under any trivial load without air conditioning at full blast and a fan aimed at the machine.

I also live in Asia (Vietnam) and my previous two laptops have had Intel chips (current: MSI GE66 i7+3070, previously an old Clevo with a 970m). I've never had noticeable thermal throttling even when running in very hot summers in rooms with barely functioning AC (which is basically every room here). My northern European body struggles - a lot - but I haven't seen my laptops being much bothered. I do a lot of intense…

Are your tasks CPU-intensive though?

My laptop idles at less than 20°C above ambient, so usually in the high 40s, but the fans already speed up when it reaches 60°C - at 37°C I have just a few degrees of wiggle room until inevitably it starts cooling more aggressively.

Re: AMD Ryzen 7 7840U Performance Benchmarks on Linux

#70

Post by rfoo » Sun, Jul 09, 2023, 4:51 PM UTC

hospitalJail wrote: post #51

KeplerBoy wrote: post #49

Earlier quoted context omitted.

Sure, i get that. I still don't think I'd want to travel or commute with that kind of laptop. That's the kind of machine I'd want docked at my desk, connected to multiple displays and all other peripherals. At that power efficiency and battery life are of little concern.

I kind of know what you mean. My bro had a gaming laptop that was gigantic and the fans sounded like a jet engine. I snagged an Asus the other day with a 3060 + 16gb ram for $800 and its small/light weight. I don't think I've heard the fans on it, but I have kids hahaha If battery life is a concern, how long do you need to remain on but not plugged in? I've used it in enough 2 hr meetings and I don't think I broke 50…

> I'm doing CAD work/GPU work.

Then you have a good reason to go for a gaming laptop, because your GPU isn't one-ssh-away.

Gaming laptop also don't mean "high qualify", they just mean "high spec". Unless you really have need for higher spec (for example, you have, because of CAD work and needs GPU attached to a screen), it's better to allocate money to build quality, battery life, lower weight or even keyboard feeling.

That doesn't mean everyone else should do. Most of the software guys need "just enough" CPU power and close to zero GPU power on their laptop. When they need more compute their beefier desktop is 1-ssh away. (Or 1 aws ec2 run-instances away for even more power)

For now I'm equally pissed off because it seems like only Apple makes proper "just enough" laptops. And Apple isn't going to stop using aluminum any time soon so their laptop will be too heavy for me to consider.