• Welcome to TechPowerUp Forums, Guest! Please check out our forum guidelines for info related to our community.

How is this possible - GTX 1660 Ti VRAM Overclock grew by +450Mhz

naxan90027

New Member
Joined
Apr 7, 2021
Messages
2 (0.13/day)
I purchased my Gigabyte 1660 Ti about 2 years ago, and I've had it running on the same MSI afterburner overclock the whole time.
Core clock +150Mhz (would crash at +165)
RAM Clock +1000Mhz (would crash at +1050)
My GPU fans started making a ton of noise so I bought replacements. They took 3 weeks to arrive and didn't even work so I decided to just remove the shroud with the fans and put CPU fans on the heatsink (Linus style). Everything worked great and I was even running 5 degrees cooler, so I then decided to also remove the plastic backplate and stick some little heatsinks with thermal pads on the back of GPU, VRM and RAM. This took the temperature down 2 more degrees for a total of 7 and I decided to revisit the overclock. Now the GPU clock still maxes at a stable +150 Mhz, like before, but the VRAM didn't crash this time at +1050Mhz. So I kept adding little by little to the RAM clock until it reached the MSI Afterburner max of +1500Mhz and It never crashed or even flinched.
Please understand, this is my first built PC, and definitely my first disassembled GPU, which you will see by the horrible picture below. Please don't laugh too hard. How is it possible that the same GPU now overclocks the VRAM by+450 Mhz more than it ever could before. Can a simple 7 degree improvement cause this, or did I most likely break some sensor on the board and am probably frying my VRAM like an egg?
Here is what I did to test it:
I ran Heaven at extreme in the background with the GPU fans off at +150Mhz GPU Clock (total 2145Mhz) and +1500MHZ VRAM (total 7500Mhz X2) Once it reached 71 degrees with the GPU clock throttled to 2085Mhz, I turned the fans on full power and it actually came back down to 63 degrees compared to my previous average of 70. Once the degrees settled at 63 (GPU clock settled at 2100Mhz), I started the actual rated benchmark so it ran for quite a while with no issues at all. First screenshot below is the GPU, and second one is of the afterburner setting and graphs, the Heaven benchmark results, and Techpowerup GPU-Z stats.

Thanks!
 

Attachments

  • 20210407_092952.jpg
    20210407_092952.jpg
    2.8 MB · Views: 87
  • Screenshot.jpg
    Screenshot.jpg
    2 MB · Views: 86
Joined
Jun 11, 2020
Messages
163 (0.52/day)
Location
Florida
Processor 3800x
Motherboard MSI Tomahawk x570
Cooling EK
Memory Ballistix E die
Video Card(s) rx 5700
Display(s) 144hz 1080p
Case Corsair Air 540
Power Supply Corsair HX750
Nope you didn't break anything, you modded it for the better. Plastic backplates need to go away forever.
 

naxan90027

New Member
Joined
Apr 7, 2021
Messages
2 (0.13/day)
You're right, I was a bit paranoid to run games on it but I took the risk and play Forza Horizon 4 at 4k Ultra for like 4 hours and it was working better than ever. I forgot to initially mention this, but I did also replace the original thermal pads and paste too. But it's still very surprising to learn how much is lost with poor manufacturing decisions. That ridiculous plastic backplate provided no rigidity, and was basically a soft cozy blanket for the GPU. I am a bit disappointed in myself for not realizing this sooner.
 
Joined
Oct 15, 2011
Messages
361 (0.10/day)
Location
Springfield, Vermont
System Name KHR-1
Processor Ryzen 7 3700X with Fclk and Uclk at 1:1
Motherboard MSI B450 Tomahawk
Memory 16 GB Corsair Vengeance LPX 3000 in XMP mode
Video Card(s) MSI Gaming X Radeon RX5600XT
Storage Samsung 970 Pro 512 GB NVMe SSD
Display(s) Acer KG271U bmiippx
Case Corsair 275R
Power Supply eVGA Supernova G3 750W
Mouse Logitech Pro (Hero)
Software Windows 10 x64 20H2
Those GTX 1660s really seem to beg for VRAM OC'ing!

OTOH, my Zotac GTX 1660 Super with the GPU core, keeps running into the power limiter. Power limit in the VBIOS of my Zotac, is very low!

No lick of instability that I saw, (what often looks like slash-lines/slash-marks on the screen, often hard to spot) when I had my GTX 1660 Super VRAM at +206 in Afterburner. Really looks like I can go higher!

But the Super, is GDDR6. But looks like both VRAM variants of GTX 1660, definitely get more with a VRAM OC.
 
Last edited:
Joined
Dec 24, 2020
Messages
741 (6.28/day)
Processor AMD Ryzen 9 3900X
Motherboard ASUS ROG Strix B550-F
Cooling Noctua NH-D15S Chromax Black | NT-H2 10g
Memory 4x 8 GB G.Skill Trident Z Neo 3600 16-16-16-36
Video Card(s) MSI RTX 3070 Gaming X Trio
Storage 1x Samsung 980 PRO 500 GB / 1x SanDisk X400 512 GB / 2x Crucial MX500 1 TB
Display(s) 1440p 144Hz ASUS TUF VG27AQ / 1080p 72Hz LG 22MP68VQ-P
Case be quiet! Pure Base 500DX Black | 3x Silent Wings 3 140mm PWM
Power Supply Seasonic Prime PX-750 80+ Platinum Fully Modular
Mouse ASUS ROG Chakram
Keyboard ASUS ROG Strix Flare Cherry MX Red RGB
Software Windows 10 Pro 20H2
Nope you didn't break anything, you modded it for the better. Plastic backplates need to go away forever.
They sure do. Glad MSI fitted mine with a graphene backplate so it helps cooling. That thing is very warm after a long gaming session.
 
Joined
Sep 27, 2019
Messages
445 (0.78/day)
Location
Canada
System Name New compy
Processor AMD Ryzen 3600x
Motherboard MSI MEG x570 ACE
Cooling Noctua NH-D15S w. FHP141 + Xigmatek AOS
Memory 32gb G.Skill F4-4000C18D-32GVK
Video Card(s) EVGA GeForce RTX 2080 FTW3 Ultra Gaming
Storage 9.5tb
Display(s) Alienware AW2518H 24" 240hz, LG 43" 4k HDR TV 43UM6910PUA
Case Thermaltake Core v71
Audio Device(s) iFi Nano Idsd Le, Creative T20 + T50, Sennheiser HD6Mix
Power Supply EVGA Supernova G2 1000w
Mouse Logitech G502 Hero custom w. G900 scroll wheel mod, G602, M705
Keyboard Corsair K68 RGB + K70 RGB + K57 RGB Wireless
Software Win 10 Pro
Benchmark Scores https://valid.x86.fr/83f50d
7500mhz x2 = 15ghz, if your ram is samsung (you can see in gpu-z what type of ram your gpu has) then you might be able to go even higher. I benched my 2080 samsung gddr6 at 16.9ghz in Crytek Noir without issue but could only do 16.4ghz in 3DMark without issues and for gaming I can't go above 16ghz without issues but 16ghz is fine for long periods of gaming.

As long as you're only increasing clock speed and not voltage your oc should be safe for your card.
 
Joined
Nov 23, 2020
Messages
66 (0.44/day)
Location
Not Chicago, Illinois
System Name Desktop-TJ84TBK
Processor Ryzen 5 3600
Motherboard Asus ROG Strix B350-F Gaming
Cooling ARCTIC Liquid Freezer II 120mm
Memory B-Die 2x8GB 3200 CL14, Vengeance LPX 2x8GB 3200 CL16, OC'd to 3333 MT/s C16-16-16-32 tRC 48
Video Card(s) 2x GTX 650 Ti BOOST 2GB Superclocked Edition
Storage Crucial M4 128GB, WD 250GB, WD 2TB, WD 3TB, Intel Optane 16GB
Display(s) Samsung S22B350 1080p77, ASUS 1080p74
Case Rosewill CRUISER Black Gaming
Audio Device(s) Onboard
Power Supply Seasonic FOCUS GM-750
Mouse Dynex DX-PWMLC
Keyboard Microsoft Comfort Curve 2000
Software Windows 10 Home x64
Benchmark Scores hold on I'll run Cinebench
They sure do. Glad MSI fitted mine with a graphene backplate so it helps cooling. That thing is very warm after a long gaming session.
Y'all get backplates?
My graphics cards
Lucky!

Back on topic, congrats OP!
The max I could get on my cards was +575 MHz, but I'm running 2GB of GDDR5 on a 192-bit bus.
I also got +15 core.
Plus the cooler is VERY efficient for a blower.
 
Joined
Oct 15, 2011
Messages
361 (0.10/day)
Location
Springfield, Vermont
System Name KHR-1
Processor Ryzen 7 3700X with Fclk and Uclk at 1:1
Motherboard MSI B450 Tomahawk
Memory 16 GB Corsair Vengeance LPX 3000 in XMP mode
Video Card(s) MSI Gaming X Radeon RX5600XT
Storage Samsung 970 Pro 512 GB NVMe SSD
Display(s) Acer KG271U bmiippx
Case Corsair 275R
Power Supply eVGA Supernova G3 750W
Mouse Logitech Pro (Hero)
Software Windows 10 x64 20H2
Joined
Nov 23, 2020
Messages
66 (0.44/day)
Location
Not Chicago, Illinois
System Name Desktop-TJ84TBK
Processor Ryzen 5 3600
Motherboard Asus ROG Strix B350-F Gaming
Cooling ARCTIC Liquid Freezer II 120mm
Memory B-Die 2x8GB 3200 CL14, Vengeance LPX 2x8GB 3200 CL16, OC'd to 3333 MT/s C16-16-16-32 tRC 48
Video Card(s) 2x GTX 650 Ti BOOST 2GB Superclocked Edition
Storage Crucial M4 128GB, WD 250GB, WD 2TB, WD 3TB, Intel Optane 16GB
Display(s) Samsung S22B350 1080p77, ASUS 1080p74
Case Rosewill CRUISER Black Gaming
Audio Device(s) Onboard
Power Supply Seasonic FOCUS GM-750
Mouse Dynex DX-PWMLC
Keyboard Microsoft Comfort Curve 2000
Software Windows 10 Home x64
Benchmark Scores hold on I'll run Cinebench
I suspect the power limit being exceeded with more than +15 Mhz for the core.
I also have the "Superclocked Edition" that gets me a +100 MHz boost to both base and boost clocks.
Max power limit is 110%.
 
Joined
Oct 15, 2011
Messages
361 (0.10/day)
Location
Springfield, Vermont
System Name KHR-1
Processor Ryzen 7 3700X with Fclk and Uclk at 1:1
Motherboard MSI B450 Tomahawk
Memory 16 GB Corsair Vengeance LPX 3000 in XMP mode
Video Card(s) MSI Gaming X Radeon RX5600XT
Storage Samsung 970 Pro 512 GB NVMe SSD
Display(s) Acer KG271U bmiippx
Case Corsair 275R
Power Supply eVGA Supernova G3 750W
Mouse Logitech Pro (Hero)
Software Windows 10 x64 20H2
With my GTX 1660 Super, I had to accept defeat with the core, because I kept getting "pwr" as the reason for throttling every time in Unigine, it will do that at default boost.
 
Top