Is that the top end of your chip or your motherboard. Working around the locked multiplier can be difficult be its just a lot of trial and error. When i first overclocked my 1035t i could only reach 3.4Ghz. I came to find out it was my ram that didnt like the link speed at that rate and had to bump up the speed of my ram. I recently spent a full 6 hours overclocking my whole rig and came up with a end result of 4.2Ghz on air. After reading a few threads on this website i believe i might even be able to go higher if i turn off cool n quiet and turbo core and a few others. Im going to start a thread maybe tommorow and put together a little tutorial. I will link it to this post when I do. Here's how i did it.
Cpu: Phenom 2x6 1035t 2.6Ghz (locked multiplier)
Mobo: Asus m4a89tdpro usb3
Cpu Cooler: Cooler Master v8 with Arctic Silver Paste.
Power Supply: Corsair 850W
Gpu: Powercolor Ati 6850
Ram: 8Gb 4x2Gb Mushkin Ddr31600 7-9-7-24 Timings@ 1.65v
Cpu Bus: 323Mhz @ 1.525v
Ram: 1600Mhz at 7-10-8-27@2 1.65v
Ht link speed: 3920Mhz
With these settings it's not quite stable under full load cores 5 and 6 will spit out a error after 15 mins on prime 95.
Here is a image of currently my highest stable configuration at 3.92Ghz hope this helps you get those clock speeds up