performance gain from i5 4690k to i7 4790k

happy easter everybody!

i know this has been discussed over and over and i don't want to start a new debate. i just hope that by throughing in my question, some people who have actually done the same could help me take the right decision. i can basically narrow it down to this:

how much gain in performance can i expect by replacing an i5 4690k @ 4.2GHz with an i7 4790k max overclocked (board: ASRock Z97 Pro4)?

Thanks, everybody.

cheers, HiLok

That really depends on what you expect as outcome !?

SingleCore performance you will maybe gain ~15-20% ..IF you can max OC to 4.8G and RAM at 2400MHz DDR3, direct linear to your increase of MHz on the CPU.

IF that is relevant, solely depends on your GPU if it can then pump more frames.

The weakest link of the chain will determine your overall strength, and this is no different with Gaming PC's.

What a question!!!

Happy Easter everybody! To get fat...

thanks, bitmaster!

from what i understand, there isn't much to gain from the i7 for DCS other than a little more on the clock frequency...

What a question!!!

because the answer is so obvious to you or ... ?

you're welcome to share some of your wisdom with us : )

True, the answer is obvious or ...

Past benchmarks have shown that HT decreases performance by about 2% on average, and ...

Wait, I need a beer.

i5 4690k is a decent CPU. The only upgrade that worth the money is new GPU (GTX 1070 - 1080 Ti) IMHO.

The hyper-threading split the core in 2 threads. You don't get the full potential of the core in one thread.

What most games need is single-process, single-thread, single-core performance to be maxed out. Hyperthreading does the opposite.

What hyperthreading does is attempt to balance 1 core between two different threads/processes, so it gives you 2 "virtual" cores for every actual core.

The idea behind hyperthreading is that there may be occasional times when 1 physical core actually can do 2 things at once for 2 different threads, for example if one thread is keeping the core busy with some memory accesses while the other thread is trying to get the core to multiply some numbers, the one actual core can probably handle doing both those things at once. Kinda-sorta.

By making the same core available to both processes at once through hyperthreading's 2 virtual cores, it might offer a bit of extra performance for that scenario. As a result, you get a small performance boost (in normal usage). However for most scenarios all it's really doing is giving half of the core's time to one process, and half to the other.

Why you don't want it for gaming is because games don't do that, it is very difficult to split the game logic across multiple cores. They typically have one process, and typically only one thread that matters. You want 100% of the core's processing time devoted to that thread, without exception. No sharing, no hyperthreading. For the game, nothing else really matters. You don't care that your computer's overall performance would be slightly higher with hyperthreading because the "overall performance" includes a lot of things you don't care about and it comes at the cost of the one thing that you DO care about: the game. You don't care that a Windows Update check happened a fraction of a second faster because it was able to do a few extra operations on the same core your game is using.

Demon,

you are like: HT & SMT :spam_laser:

With AMD it comes for free and maybe even Intel will make it happen for all and cancel the "excuse me" inferior i5 when they have to compete Ryzen.

What you say, 100% right. Still, a lost battle, they all go SMP one or the other way I guess

Past benchmarks have shown that HT decreases performance by about 2% on average, and ...

Wait, I need a beer.

Yep which is why I have HT off in BIOS when playing my games, none of which benefit from HT. General pc usage and my photo editing software I turn it on.

Demon,

With AMD it comes for free and maybe even Intel will make it happen for all and cancel the "excuse me" inferior i5 when they have to compete Ryzen.

Or if not cancel they drop the prices significantly on the i5-7600K and others within the i5 range. The 4 core 4 thread i5 CPU is seriously looking dated when you can have a 6 core 12 thread CPU for around the same price or less and which isn't exactly miles off the i5 in gaming.

oceandar, thanks for the gpu suggestion -i was already looking into that direction.

demon, thanks for the little course in HT -i was in doubt whether the i7 brings an added value for games compared to the i5 (mainly because most gamers have i7's), but that pretty much nailed it down for me : )

thank you very much, guys!

cheers, HiLok

They have the i7 because the stock frequency is higher and they don't want/know to overclock.

I had an i7 920 Oced to 3.6Ghz on my previous build

The HT was disabled because nothing took advantage of it and it added 10deg C to the operating temp

Current PC has an i5 2500k OCed to 4.5Ghz and it is a pretty decent processor even tho it 5 years old

I will wait a bit longer before I upgrade

You have a pretty good CPU as it is, not even the latest Kaby Lake ones are worth upgrading to, especially for DCS World.

If you OC it, you can see how that i7 would perform because HT won't do anything for DCSW AFAIK.

If you OC it, you can see how that i7 would perform because HT won't do anything for DCSW AFAIK.

Best advice of the thread. It's not worth an upgrade, not for DCS anyways.

That really depends on what you expect as outcome !?

 

IPC wise you will roughly gain ~15-20% ..IF you can max OC to 4.8G and RAM at 2400MHz DDR3

 

IF that is relevant, solely depends on your GPU if it can then pump more frames.

 

 

The weakest link of the chain will determine your overall strength, and this is no different with Gaming PC's.

IPC must be almost the same for the both processors (same architecture).

Ideally IPC (per core) doesn't change with the clock frequency when talking about the same architecture.

I've said that many times. Unless you have an unlimited budget, if it's the gaming PC get the i5. Even assuming that there are titles that use the HT, the profrmance will get a much higher boost from investing the difference between i5 and i7 into other components like better GPU, more RAM or an SSD. Getting i7 is spending a lot for gaining little or even in some cases loosing a bit of the performance.

IPC must be almost the same for the both processors (same architecture).

Ideally IPC (per core) doesn't change with the clock frequency when talking about the same architecture.

The OP asked what he could expect from an max overclocked i7 4790k, hence my answer.

I may should have choosen another term than IPC when I said 15-20% gain, correct, that is misleading. IPC remains inherent to the CPU architecture unchanged, what changes is your single core performance by that number I gave/guessed. All only caused by more cycles/second and maybe some faster RAM.

sorry for the confusion with terms

* I edited the #2 post to now say SCP and not IPC

Good mess of links concerning CPU use.

Thanks for the video link.