Z790 Lightning-very slow after BIOS updated
Printed From: ASRock.com
Category: Technical Support
Forum Name: Intel Motherboards
Forum Description: Question about ASRock Intel Motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=92231
Printed Date: 27 Jan 2025 at 11:19pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: Z790 Lightning-very slow after BIOS updated
Posted By: Yodaminium
Subject: Z790 Lightning-very slow after BIOS updated
Date Posted: 26 Jan 2025 at 1:00am
HI.
I have a MUCH slower PC after the latest BIOS upgrade.
PC details below:
Z790 PG Lightning DDR5
Corsair 5200 32GB
Intel 13900K
280mm AIO
lots of fans in push/pull config.
I went from CPU speed 4.9-5.7Ghz down to 3.5-4.6 Ghz
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I was running an older BIOS (10.xx I believe it was) and things were fine as far as speed, but I was having video card driver crashes randomly and frequently (like every hour or so).
I tested my video card in a known stable PC (my sons) and this did not happen so the video card is fine.
I then though, OK-Old BIOS (at work we update BIOS regular to avoid these types of issues), so must be time to update.
I had implemented the XMP profile and set the intel defaults so I disabled XMP reset BIOS to defaults.
The I flashed the latest BIOS Z790-PG-Lightning_16.02.ROM
after reboot, I leave it on performance setting (the two modes have changed names since BIOS 10.xxx - it used to be load BIOS defaults or Load Intel limits).
I reboot to Windows and check task manager without doing anything else.
My CPU speed has dropped by a LOT.
BEFORE BIOS update at idle 5-5.4 Ghz
Before in use in gaming and/or media manipulation the CU ran between 5-5.7
As to the above numbers I DID get drops to 4.6 - 4.9 when the intel algorithm decide that advantageous boost to performance was costing to much heat but,the CPU speed would drop for a second, maybe two then right back up to 5.4-5.7Ghz
After the BIOS update
I have not yet tested speed in games or media manipulation however, my CPU is now running between 3.5-7 and 4.6-7 Ghz.
This is a drastic loss of speed with a BIOS update.
I DID re-implement the XMP profile
I DID set the BIOS to performance mode.
I am going to try then other mode for the BIOS but if performance mode is such a drastic loss of speed I don't hold much hope for the other mode to be faster-I believe it will be slower. I will try after I post this.
I am benching the CPU right now as I type this and it is getting 4.4Ghz--I mean thats just way to slow for this CPU/Motherboard/AIO combination.
Intel advertised this CPU as being capable of 5.8Ghz with the proper cooling (360mm AIO)
AsRock also promised these speeds with the proper cooling and motherboard settings.
Otherwise I'd have purchased a EVGA Z790.
ANY help in getting my speed back would be greatly appreciated.
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Replies:
Posted By: Yodaminium
Date Posted: 26 Jan 2025 at 1:23am
I cannot even get 5.0Ghz oput of this 5.8Ghz CPU
BEFORE the BIOS update I would see regular 5.6-5.7Ghz
and while gaming a rock steady 5.3-5.4 Ghz...
I have the current BIOS set to defaults except for XMP profile with performance mode selected.
My other choices it seems are standard mode and power saver-both of which I assume, based on their names, will slow my PC down further.
Should I contact support maybe?
I see people looking at my thread but no one is posting any ideas, answers, thoughts, so I am assuming no one knows how to fix this?
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Posted By: Yodaminium
Date Posted: 26 Jan 2025 at 1:27am
LOL
I just tried:
Standard mode: I get 1.2-2.5Ghz
Power Savings: I get 0.97Ghz -1.30 Ghz
OMG I am seriously annoyed right now.
This is going over to support.
This is pathetic.
Anyone who does reply with any suggestions know that I DO thank you very,very much.
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