Is the i7-4790 just as good as any modern day i5?



Look the i7 4790k is even beaten by the 6th gen intel i5 6600k from 2015. How recently far back do we need to go.
http://cpu.userbenchmark.com/Compare/Intel-Core-i7-4790-vs-Intel-Core-i5-6600K/2293vs3503

OP asked if his i7 is as good as any modern i5 and it isn't. If he had asked if it still hold up in gaming then that's a different question.
 
The 4790 will not beat a modern i5 (non K) in games, it has about 10 percent slower.
The 4790k will just about draws with a i5 7600. The 4790 will not.
The 4790k will lose to any modern (8th, 7th gen) core i5 that is the K version and has that higher clock.

If you have the 4790k you're good, if you have the 4790 you lose by 10-20 percent to modern core i5 in gaming. As a workstation CPU the 4790k does have a multithreading advantage though.

 
The 4790 will not beat a modern i5 (non K) in games, it has about 10 percent slower.
Does it need to? If it can maintain a target FPS, which it is entirely capable of unless you're shooting for 120/144 Hz, that's all that most gamers need. The extra threads only help its case.

The 4790k will just about draws with a i5 7600. The 4790 will not.
Til it's overclocked or the extra threads are thrown into the mix. Granted, a 7600k will overclock more for a higher IPC, BUT lots of games are now taking advantage of >4 threads, which means that the 4790k would still be ahead for smoothness/playability.

TL/DR: there is absolutely no reason to upgrade to a 4-core Sky/Kaby Lake from either a 4790 or 4790k. Coffee Lake chips might be tempting if you're streaming while gaming, are a heavy multitasker, or do lots of video editing or productivity tasks due to the increased core count, which will pull ahead of any of the previous 4-core i5/i7 lineup when something utilizes all that power.

Non-gaming benchmarks are fun and all, but they don't often translate to everyday usability or performance gains worth the cost upgrade.
 
It does need to beat the modern i5 if the question was "does this chip beat this one". Gaming wasn't even mentioned so I looked at workstation and gaming capabilities combined. If we are talking about higher resolutions that is primarily GPU bound anyways.

Overclocking wasn't mentioned either and it's a completely unhelpful variable. You can overclock a 2500k enough to be able to complete with Ryzen 5 in games. It is only worth noting that the 4790k is overclockable and that's assuming that it's not just a 4790. Most end users do not say their exact part number and letter by word of mouth so I took that into consideration as well.

Without knowing if it's the higher clocked k version and what the CPU is being used for the question can't be answered accurately and all you can do is make extrapolations.
 


by 13%, also userbenchmark? really? lol
 


Yes really. A loss is a loss. 13% is a big margin.