The End of Hyper-Threading

simultaneous multi-threading

a feature that intel calls
"hyper-threading"

has become a real main-stay on
consumer CPUs

hyper-threading allows a single CPU
core to process two threads at one time

and while this isn't quite as powerful
as just having two physical cores

certainly improves performance in many
applications

becoming important enough since it was
originally introduced in 2002

to spread to a huge number of chips

as far down as the lower-end Core i3
series

but get this... intel is planning to ditch
hyper-threading after twenty-two years

with the launch of its Lunar Lake and Aero
Lake processors later this year

why would they get rid of what seems like
such a useful feature?

I mean do they not want to beat AMD?

A big part of this is the hybrid chip
design

that intel started rolling out with
their Alder Lake CPUs in 2021

instead of having all the cores be
basically identical

Team Blue instead
gave us "P" or performance cores

and "E" or efficiency cores

especially important for laptops
as battery life is of paramount concern

and you don't want to waste energy
putting processes

through more power hungry cores

if you just don't need the extra
performance

according to Intel, current P cores give
you about 30% more average throughput

when hyper-threading is enabled

but at the cost of 20% increase in power
consumption

and even if you're not running off a
battery, this can matter a great deal

in places like data centers

where you're trying to move as many
threads as possible through your chips

meaning power consumption becomes an
important concern and a big cost

so how is intel trying to solve this power
problem without losing that magic

hyper-threading performance?

we'll give you the answer right after we
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although E cores obviously don't have the
same processing muscle as P cores

Intel says its much more efficient to run
extra threads on those E cores

instead of using hyper-threading on P
cores

with the way the operating system
schedules threads

it doesn't invoke hyper-threading until
all cores, both P and E,

have been populated in order to maximize
power efficiency

Intel says that by foregoing
hyper-threading and instead just having

more E cores. You get a 15% increase in
IPC, that's Instructions Per Clock

per unit of power. And a 10% IPC increase
per unit of die area

hyper-threading is still better in terms
of IPC per die area when you don't have

those additional E cores

but seeing as Intel seems committed
to hybrid chip design

which also allows them to pack more cores
onto their CPUs then in the past

Team Blue seems confident users won't
particularly miss hyper-threading

remember that the feature was originally
designed for a CPU that had just one core!

Intel's benchmarks back this idea up with
Lunar Lake

beating the previous gen meteor chips
fairly comfortably despite consuming a

similar amount of power

of course we'll have to wait and see what
independent benchmarks

say once the chips actually hit the market

but the focus on the efficiency isn't
surprising

considering Intel is trying to stay ahead
of the ARM based offerings from both

Apple and Qualcomm, which are touting
power efficiency as a major selling point

but if you really do end up missing
hyper-threading

it could be a great time to invest in a
really high performance sewing machine

a-yo

I'm sorry. I'm sorry everyone

thanks for watching guys!
if you liked this video

check out this video on another
type of CPU Intel killed

called "Itanium"

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