Monday, March 20th 2023

12-core AMD Ryzen 9 7845HX "Dragon Range" Matches Desktop 7900X with 130W PBO2

by
btarunr
 Discuss (10 Comments)
The 12-core/24-thread AMD Ryzen 9 7845HX "Dragon Range" mobile processors for enthusiast-segment notebooks, are capable of performance that matches the desktop Ryzen 9 7900X, with an easy 130 W power limit enabled along with Precision Boost Overdrive 2 (PBO2), with the "Enhanced" performance mode set on certain ASUS ROG laptops. The 7845HX is capable of drawing up to 110 W of power in its stock settings, which sees it offer a single-threaded boost frequency of 5.25 GHz, and 4.70 GHz all-core, and around 25000 points in Cinebench R23 multi-threaded. The Enhanced mode, which can be set via software on ASUS ROG laptops, raises the power limits, which makes the 7845HX draw up to 130 W of power, hitting temperatures of up to 93 °C, vastly improving boost frequency residency.

The 7845HX is "unlocked," and the UEFI setup program of ASUS ROG laptops offer several manual overclocking controls on par with the desktop platform. Manual overclocking along with PBO2, Curve Optimizer, and Maximum Boost Technology, yields up to 5.45 GHz single-threaded boost, and 5.10 GHz multi-threaded boost, yielding a 14 percent improvement over the stock frequency Cinebench R23 score, hitting 28542 points, which is on-par with that of a desktop Ryzen 9 7900X—a processor with 170 W TDP and 230 W PPT.
Sources: Wccftech, ChipHell Forums

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10 Comments on 12-core AMD Ryzen 9 7845HX "Dragon Range" Matches Desktop 7900X with 130W PBO2

#1
ratirt
Not bad for the performance but 130W is a bit steep for a laptop though.
Posted on Reply
#2
Karti
ratirtNot bad for the performance but 130W is a bit steep for a laptop though.
ofc it is a bit unreal and not "good" for a mobile device

tho you know what is funny?
Almost no one gonna see anything wrong about or just say "but Intel does that too"
which just proves how short sighted some people are
Posted on Reply
#3
ratirt
Kartiofc it is a bit unreal and not "good" for a mobile device

tho you know what is funny?
Almost no one gonna see anything wrong about or just say "but Intel does that too"
which just proves how short sighted some people are
Intel does what? I'm not sure I understand. The 130W in a laptop? I don't think it is unreal. The thing is, the power envelope for laptops has been going up in recent years. The problem I see here is not the power but if it can dissipate all that heat without burning your hand when you keep it on the laptop. The other issue is, if the 130W power is really necessary to achieve decent performance and how will the CPU scale with the lower power envelope. Obviously you lose performance but by how much. Obviously this ties with the CPU and GPU working together. If you have a 130w CPU which is powerful in a laptop and you pair it with a GPU that also uses quite a bit of power, you have a problem with heat. Though, if you use a CPU with lower power envelope, it may not be sufficient to sustain GPU's full load but save power and keep the system cooler or easier to cool. Situation changes if you use APU or iGPU.
Posted on Reply
#4
usiname
Kartiofc it is a bit unreal and not "good" for a mobile device

tho you know what is funny?
Almost no one gonna see anything wrong about or just say "but Intel does that too"
which just proves how short sighted some people are
The difference is that Intel is using 150W+ with stock settings, imagine when OC. The 7845HX was overclocked. In normal condition if you run 7845HX with 40-50W you will lose 10-20% performance, while Intel will lose 30-40%.
Edit: 13900h stock - 167W cinebench R15 :roll:
20k score in R23, 50% less with probably 20% more power than 7845HX
www.notebookcheck.net/i9-13900H-vs-i9-12900HK-vs-i5-13505H_14717_14041_14988.247596.0.html

13900hx 220w R15
28950 R23, with only 80% more power, sweet sweet. 7945HX will eat it for breakfast with half the power
www.notebookcheck.net/Intel-Core-i9-13900HX-Processor-Benchmarks-and-Specs.671451.0.html
Posted on Reply
#6
ncrs
fancuckerReminder that AMD mobile CPUs will be overall less efficient due to high idle power consumption

www.notebookcheck.net/Asus-ROG-Zephyrus-Duo-16-Notebook-Review-Multitasking-monster-with-AMD-Zen4-RTX-4090-Mini-LED.701152.0.html

Stick with Intel for better battery life
Reminder that idle power consumption is a combination of multiple factors

www.notebookcheck.net/Razer-Blade-18-laptop-review-Smaller-than-many-17-inch-gaming-laptops.694686.0.html#toc-7 - like here, where in the comparison table AMD Ryzen has lower idle power consumption than all the Intel-based models

Stick with a design that suits your needs best ;)
Posted on Reply
#7
r9
Laptop comes with fire extinguisher also at boost clocks the battery lasts about 4 minutes otherwise expect boost duration of 100ms.
What they did sounds like something a friend of mine did about 30 years ago when he screwed a CRT monitor to his PC case and called it a laptop. lol
Posted on Reply
#8
docnorth
Since it draws power like a (AMD) desktop CPU, it performs like a desktop CPU.:sleep:
Posted on Reply
#9
Minus Infinity
docnorthSince it draws power like a (AMD) desktop CPU, it performs like a desktop CPU.:sleep:
Well it uses 130W vs 7900X 170W, so that alone means they have made good improvements in efficiency for the APU parts. And in stock 110W mode it's not far behind.
Posted on Reply
#10
docnorth
Minus InfinityWell it uses 130W vs 7900X 170W, so that alone means they have made good improvements in efficiency for the APU parts. And in stock 110W mode it's not far behind.
It's like a 7900x with better power management and probably slightly undervolted. AMD can do even better in terms of efficiency, as the 7600 and 7700 non-x already proved.
Posted on Reply
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