Hi bonvoyage
I have Maximus VI Hero and Formula and am referring to those manuals. Z97 board BIOS should be similar. I used the HD4600 exclusively for a few months and still do occasionally. The integrated graphics seems to be more stable than PCIe graphics cards when doing 2D benchmarks with bclk more than 3% off nominal.
On the Extreme Tweaker tab, after the core, cache and memory ratio settings is CPU Graphics Max Ratio. Default is Auto. It can be set to a ratio for the multiplier in steps of 50MHz: 25 = 1250MHz, 30=1500MHz, etc. iGPU clock remains adaptive, running down as low as 600MHz when idling and up to the manual setting when loaded.
Down lower on that BIOS page is the setting for CPU Graphics Voltage. I have always needed to raise that when overclocking the iGPU. An average 4770K needed 1.24 Vgpu for 1700MHz (34 ratio). A good 4790K needed 1.18 Vgpu for 1700MHz. Some good HD4600 will run at 1750MHz, but I've never seen one that would be fully stable at 1800. I use OCCT GPU test for iGPU stability testing while tweaking. Absence of detected errors over a 2 minute test has proven to be effective.
Jeff
I have Maximus VI Hero and Formula and am referring to those manuals. Z97 board BIOS should be similar. I used the HD4600 exclusively for a few months and still do occasionally. The integrated graphics seems to be more stable than PCIe graphics cards when doing 2D benchmarks with bclk more than 3% off nominal.
On the Extreme Tweaker tab, after the core, cache and memory ratio settings is CPU Graphics Max Ratio. Default is Auto. It can be set to a ratio for the multiplier in steps of 50MHz: 25 = 1250MHz, 30=1500MHz, etc. iGPU clock remains adaptive, running down as low as 600MHz when idling and up to the manual setting when loaded.
Down lower on that BIOS page is the setting for CPU Graphics Voltage. I have always needed to raise that when overclocking the iGPU. An average 4770K needed 1.24 Vgpu for 1700MHz (34 ratio). A good 4790K needed 1.18 Vgpu for 1700MHz. Some good HD4600 will run at 1750MHz, but I've never seen one that would be fully stable at 1800. I use OCCT GPU test for iGPU stability testing while tweaking. Absence of detected errors over a 2 minute test has proven to be effective.
Jeff
Aida64 shows about everything. It's not free, but has a free trial. Aida64 is great at monitoring, but only so-so as a stability test in that it doesn't check for errors.
Jeff
Jeff
It slipped my mind to mention - when the iGPU is idling, it's voltage drops all the way to 0 and doesn't register in Aida64. Try the sensor page while running the 'stress GPU' stability test or some other software that exercises the GPU compute power.
Only a few HD4600 will run at 1750. 1650 has been a sure thing for me.
Jeff
Only a few HD4600 will run at 1750. 1650 has been a sure thing for me.
Jeff
